Stupid Joke

A guy goes to a Halloween party with nothing but a girl on his back. "So what the hell are you supposed to be?" the host asks. "I'm a snail" says the guy. "How's anybody supposed to get that?" scoffs the host. "How can you be a snail when all you've got is that girl on your back?" "That's not just any girl, buddy" says the guy slowly. "That's Michelle".