A bloke went to his mate's fancy dress party with nothing but a girl on his back.

"So what the hell are you supposed to be?" the host asked. "I'm a snail." The bloke replied. "What a load of rubbish!" the host spat. "How can you be a snail when all you've got is that girl on your back?" "That's not a any girl, mate," the bloke replied, "that's Michelle".