Talk about self control: In his new WB Candid Camera-esque sketch comedy, The Jamie Kennedy Experiment (premiering Sunday at 8 pm/ET), Scream star Jamie Kennedy has to adopt a variety of outlandish personas — including a Malibu-bred hip-hop wannabe and an overzealous infomercial host — without ever cracking up. However, Kennedy confesses to TV Guide Online that he did break down while shooting a skit in which his character can't stop drooling as a result of jaw surgery.

"I started laughing, but you can never tell I'm laughing because I have my mouth open," the 30-year-old stand-up comic-cum-practical joker recalls. "I just thought, 'If this is how it's going to be, I don't know how I'm going to do this!' But ever since that bit, I've never laughed. I've always really been in it."

Although Kennedy has appeared in a number of high-profile films, including Bowfinger and Three Kings, he isn't concerned that the show's unsuspecting "victims" will recognize him under those disguises. "I'm going to look so different every time," he explains. "And I was only busted once so far [by a Scream fan]. We've done 19 [skits] and only one person busted me."

The Pennsylvania native doesn't have to worry about anyone recognizing him from his first acting gig — as an extra in Dead Poets Society. Heck, the star of the 1989 pic probably wouldn't even remember him. "Robin Williams would walk by and I would try and say something to him and the security guard would say, 'Please don't talk to Mr. Williams,'" he relates. "And actually, my friend and I were bugging him so much that at one point someone came over the [public address system] and said, 'To all background extras, please do not approach Mr. Williams. He's a very shy man.'"