A bloke went to his mate's fancy dress party with nothing but a naked girl on his back. ''So what the hell are you supposed to be?'' the host asked.
''I'm a snail,'' the bloke replies.
''What a load of rubbish'' the host spat. ''How can you be a snail when all you've got is a naked girl on your back?''
That's not a naked girl mate, the bloke replied. ''That's Michelle.''