Jon Stewart checked in on the "Occupy Wall Street" movement that's expanded globally since he left for vacation from 'The Daily Show' (Weeknights, 11PM ET on Comedy Central). For the most part, he appreciated that people have been able to demonstrate peacefully and get their message of dissatisfaction with the status quo across.

But all it takes is one person to derail that message.

"For all their popularity, for their participants with thoughtful critiques of our power structure, there's also this," he said throwing up a photo and then explaining. "A guy taking a s*** on a police car."

Yeah, that's not at all in line with the "Occupy Wall Street" message, but it could be something for opponents to grab onto, and then suddenly their true message becomes muddled.