It may not have been a big stretch for Michael Cera to get his geek on at Comic-Con. There to promote 'Scott Pilgrim vs. the World,' he decided to line up for the film's Scott Pilgrim Experience, where fans could get custom T-shirts and meet the cast.

How did he get away with this? A handy gorilla mask. "I didn't see any other gorillas, but I fit in because people wore masks there," he explained on 'Late Night' (weeknights, 12:37AM ET on NBC). But he still became the center of attention.

"People came up to me and wanted to take a picture with me just as a guy wearing a gorilla mask. No one knew it was me, but they wanted to take a picture with the gorilla guy."

Actor that he is, he assumed the persona of "the guy who went to Comic-Con wearing a gorilla mask." So ... any pictures floating around FaceBook of a "gorilla party animal" at Comic-Con? That would be Michael Cera.