While preparing to play a struggling comic in this summer's Judd Apatow film Funny People, Seth Rogen performed a few secret gigs in Los Angeles to get in touch with his stand-up roots. Now, it's possible to see just how far those roots extend, as a YouTube clip has surfaced of the teenage Rogen performing at a Vancouver comedy club. Squeaky-voiced and holding steady at the fighting weight he was recently forced to slim back down to, Rogen regales the crowd for ten minutes with jokes about Jews, school, and sports. While the set's G-rated humor gives little sign that this young Canadian talent will grow up to someday date-rape Anna Faris onscreen, Rogen nevertheless showed precocious promise. The clip, after the jump: