Propofol was the powerful drug that was administered to Michael Jackson before his death, and helped lead to the manslaughter charge against his doctor, Conrad Murray. On 'The Graham Norton Show' (Sat., 10PM ET on BBC America), Robin Williams talked about the power of the drug and his own experiences with it.

Put quite simply, Williams was on Propofol during heart surgery, giving a pretty clear indication of its strength. "It's a devastatingly powerful drug that has to be administered in a hospital situation, and he was doing it at home," Williams said of Jackson.

He talked about waking up from the surgery, disoriented from the drug. He'd received his surgery in Cleveland, and yet when he was told where he was, his first question was, "Why?"

It's always entertaining when Robin Williams is doing his thing on a late night talk show, but there was perhaps no one more entertained than host Craig Ferguson on 'The Late Late Show' (Weeknights, 12:37AM ET on CBS). Ferguson was telling a story about a sign he saw in a Scottish bar warning people about chlamydia.

At this, Williams erupted from his seat and shouted in a thick Scottish accent, "Chlamydia, your dad's here! He parked the van out back."

That was all it took for Ferguson to completely lose his composure. He so couldn't believe what he'd just heard that he had to confirm Williams said what he thought. "That's the stupidest thing I ever heard," he laughed. Stupid funny, perhaps, based on that reaction.

Robin Williams and Craig Ferguson both know a thing or two about offending people. In this modern era of instant Internet feedback, it seems it's getting harder and harder to not offend people. Which is why, according to Ferguson 'The Late Late Show' (Weeknights, 12:37AM ET on CBS), you stick with Nazi jokes.

Williams modified that claim, though, with one caveat. It doesn't work if you're in Germany, as he found out first-hand. On a talk show, he was asked why he thought there aren't as many comedians in Germany.

"Did you ever think you tried to kill all the funny people?" he replied. The answer was not received with laughter.

Once Robin Williams gets going, it can be tough to slow him down. Such was the case today, when he stopped by 'The View' (weekdays, syndicated on ABC) and Joy Behar promptly asked him about Donald Trump. Williams took over from there, joking about what a Trump presidency might actually look like, and aiming some barbs directly at his hair.

Williams imagined that if elected, Trump would turn the White House into a casino, and theorized that his hair may be a sentient being that controls him. "I believe the hair is actually The Donald," he said. "That's actually the creature." He pictured Trump getting home in the evening and the hair asking him questions. "How are we doing today? Who shall we marry next?"

Regis Philbin explains how difficult airport security is for him given his titanium hip replacement, and Robin Williams imagines the host getting a cavity search from a TSA agent on 'Live With Regis and Kelly' (weekdays, syndicated).

Security officials usually realize who Regis is, but usually subject him to a search anyway. "It's a titanium hip and when you go through the thing, you know, at the airport, I always tell the guy, 'I've got a titanium hip!' and he's telling me, 'My mother loves you!'"

Robin Williams understands exactly how Melissa Leo came to inadvertantly drop the f-bomb during the Academy Awards. As he explained it on the 'Late Show' (Weeknights, 11:35PM ET on CBS), "The moment they announce your name, English becomes a second language."

As for the f-bomb? "It's not a bomb. No one got hurt." Certainly Williams has colorful language, though he's more prone to manic outbursts than rampant cursing in his television appearances.

He was a bit more subdued here. He also implied that Oscar winners should enjoy their Oscar noteriety while they can. Williams won for 'Good Will Hunting' in 1998. He says there's "about a week where everybody's like -- Hey, 'Good Will Hunting.' way to go! -- 'Good Will Hunting.' Academy Award, way to go."

To mark the 25th anniversary of the classic 1980s film 'Back to the Future,' new footage was released. These outtakes showed the original casting of Eric Stotlz as "Marty McFly."

Though we all know and love Michael J. Fox as the time-traveling teenager, he wasn't the first person cast in the film. But some things just feel right. And so, Eric was eventually replaced with Michael -- even though changing actors added about $3 million to the budget.

Hmm ... So according to 'Back to the Future,' you can remake the past or the present -- and casting choices can be remade as well. But once you start questioning your original decisions, there's no telling how far you can go. And on the new 'SNL' (Sat., 11:30PM ET on NBC), the cast members decided to see just how far they could go with it.

Well, someone has to step in for Larry King eventually. Current almost-confirmed rumors name Piers Morgan as King's successor on CNN. But maybe his replacement could be Jimmy Fallon instead?

Fallon took a break from hosting 'Late Night' and appeared on 'Larry King Live' (weeknights, 9PM ET on CNN). While he was on the show, he demonstrated a pitch-perfect ability to imitate Mr. King, indicating -- to us, at least -- that he could fill Larry's shoes if necessary. Wearing Larry's trademark suspenders, he acted as the "replacement" host of the show, and showed an uncanny ability to switch between different voices in 0.5 seconds.

Actor Matt Damon received a big award during a star-studded gala event on 'Hollywood Salutes Matt Damon: An American Cinematheque Tribute' (Thu., 9PM ET on ABC). A ton of celebrities were in attendance, including Jimmy Kimmel, Robin Williams, Ben Affleck and Clint Eastwood.

One celebrity who couldn't be bothered to show up: George Clooney. Although Clooney did send a video message to Damon. Unfortunately, the message ostensibly took place while George was getting an "elective prostate [exam]" from a doctor.

Clooney appeared a little distracted while sending his message, but -- hey, at least he cared enough to call. "Tonight, you have an American Cinematheque Award," he said to Matt. " ... Ooh! Aaah!" These weren't necessarily sounds of excitement; they were more like noises resulting from the doctor's activities.

More cow valve! When 'The Daily Show' (weeknights, 11PM ET on COM) host Jon Stewart asked Robin Williams how his post-surgery heart was doing, the actor didn't mince words.

Always quick with a routine, this one a Christopher Walken impression, "More cow valve," Williams painted a not so lovely image.

"The wonderful thing about a cow valve is you can [bleep] standing up," Williams said, causing Stewart to double over in laughter -- or horror.

"I did not need that image," Stewart said. Us too Jon, us too.

Watch the video after the jump.

Last night on 'The Tonight Show,' Robin Williams serenaded Conan O'Brien with a profanity-filled Irish jig expressing a none-too complimentary opinion of NBC and its executives.

Williams appeared on the penultimate 'Tonight Show' featuring O'Brien as host and belted out the dirty ditty, which came complete with rude hand gestures and Irish step dance.

Watch the video after the jump.

First she did a twirly hug, then made an odd, slurry joke about a kitten, spoke at a rate of about one word per minute and seemed to have her own personal hype man ('Precious' director Lee Daniels). And what did we do while we watched Mariah Carey's acceptance speech for Breakthrough Actress at last weekend's Palm Springs Film Festival?

We winced. We cringed. Then we watched it again.

Carey's, uh, loosened speech was the first genuinely awkward moment this award show season, but there were many actors, filmmakers, and musicians before her who've heard their name called, stepped to the podium, and made things a little weird for everyone.

• At 7, CBS has a new 60 Minutes, then the season finale of The Amazing Race and a new Cold Case.
• NBC has a new Football Night in America at 7, followed by Vikings vs. the Cardinals.
• At 7:30, Disney has a new Hannah Montana.
• At 8, ABC has a new Extreme Makeover, then new episodes of Desperate Housewives and Brothers & Sisters.
• FOX has the BCS Selection Show at 8.
• Hallmark has the movie Debbie Macomber's Mrs. Miracle at 8.
• Also at 8: TLC has Crazy Christmas Lights, followed by Invasion of the Christmas Lights.
• At 8:30, Disney has a new Jonas.
• At 9, Syfy has the premiere of Alice.
• Showtime has a new Dexter at 9, followed by a new Californication.
• HBO has Robin Williams: Weapons of Self-Destruction at 9.
• At 11:45, Cartoon Network has a new Robot Chicken, then new episodes of The Venture Brothers and Metalocalypse.

Check your local TV listings for more.

"I guess obviously you've downsized. You had to sell the desk." -- Robin Williams

Leno's had a couple of nights now to get a feel for what kind of show he wants to do, and figure out how to stay relevant in prime time. Most of the feedback that I've seen from people who saw it hasn't been very positive. They're disappointed that it feels so much like The Tonight Show.

If one of the ways he's trying to differentiate himself is by having longer comedy bits and fewer guests, then I think that's backfiring a bit because every single comedy video he's shown has gone on way, way too long. It's as if they're trying to create internet viral-worthy videos like Saturday Night Live has with their "Digital Shorts," but they're missing the mark.

Anyone who's interested in the Leno/Letterman relationship, the feeding frenzy in the late 70s and early 80s when networks were sweeping up stand-up comedians and changing their lives overnight, and the importance and mechanics of getting a spot on Johnny Carson's Tonight Show needs to read William Knoedelseder's new book, I'm Dying Up Here: Heartbreak and High Times in Stand-Up Comedy's Golden Era.

The centerpiece of the book is the labor discontent between comedians and the Comedy Store that kicked up in 1979, when comedians saw the money coming into the venue and started to wonder why some of the working comics there had to borrow money for breakfast. It's a compelling and unexpected story, and it collects names big and small from television history along the way.