Teen Wolf

A very young Michael J. Fox is faced with the near-impossible task of scoring a keg of beer. He somehow musters the courage to go to a liquor store and ask the old attendant for a keg. Seeing the young boy's scared expression and a lack of valid ID, the man snubs Fox.

What follows is a deadly transition from a pimple-clad teenager to a red-eyed monster with a deep voice. Fox, in his new avatar, manages to scare the old man--and more importantly score the beer! 

-Picture courtesy Wikimedia Commons-