#1: What are you doing?
#2: Watching a movie.
#1: Oh, I know why, because you move-ie.
#1: What are you doing?
#2: Watching a movie.
#1: Oh, I know why, because you move-ie.
Hey, genius. The joke here is a classic pun. Person #2 is "watching a movie." Movie sounds like "move-ie" which sounds like "you move". So person #1 is saying you are watching a movie BECAUSE "you move-ie". Get it, dummy?