Talk about being politically incorrect. (Okay, you've been warned.) Chris Kattan of "Saturday Night Live" was among the celebrities attending Wednesday night's special screening of the new Sean Penn - Michelle Pfeiffer movie, "I Am Sam." In it, Penn plays a mentally handicapped father engaged in a custody battle over his young daughter. Although his tongue was planted firmly in his cheek after seeing the drama, Kattan, 31, told PEOPLE that he could handle a role such as the one played by Penn. "I love any movie that has a retarded person working in Starbucks," he said. "I would rather be a disabled person in Virgin Records. I haven't seen that one before. I'd be nude, retarded and helping someone find a CD. He would be requesting the Beatles, but I'd keep giving him Enya." As it is, Kattan has a film coming out this summer called "Undercover Brother," in which he plays a character called Mr. Feather who "wants to change all black people into white." No further details on the film. As for others who saw "I Am Sam": Rob Thomas, of Matchbox 20, with his wife, Marisol; magazine editor Tina Brown; actor Adrian Brody; musician Moby; and actress Angie Harmon, who arrived without her husband, Jason Sehorn, because, she said, he was in Los Angeles shooting a commercial.