The National Geographic Channel is using humor to sell it's ambitious new special Stonehenge Decoded. Christopher Guest has resurrected his Spinal Tap alter ego for National Geographic Channel, lead guitarist Nigel Tufnel, to expound on his theories about how Stonehenge came to be. Naturally, even as he's promoting the special and National Geographic, his tongue is firmly planted in cheek as he disses the findings of the scientists and purports to be an expert on the subject.

Guest as Tufnel is interviewed by straight man -- comic actor -- Jim Piddock, leading to riotous takes by Nigel about dinosaurs, the secret language of potatoes, the pyramids and other weighty affairs. Here's one of the videos (after the jump), so you can see what I mean:

Veteran actor Bruno Kirby, who viewers of Entourage saw just a couple of weeks ago on the show, has died of leukemia. He was diagnosed with the disease recently, and died on Monday.

Most people will know Kirby from his roles in When Harry Met Sally... and City Slickers, playing Billy Crystal's best friend in both films, but he had a ton of film and TV roles, including Good Morning, Vietnam, Donnie Brasco, Hoffa, Sleepers, and This Is Spinal Tap. His long TV resume includes guest spots on Frasier, It's Garry Shandling's Show, Tales From The Crypt, Columbo, Homicide, Mad About You, Kojak, Emergency, Room 222, and M*A*S*H.