While out shopping with his mother, Little Billy puts his hand up a mannequin’s skirt. His mum smacks his hand and says, “Don’t do that, there’s teeth up there, they’ll bite your fingers off”.
Years later when Little Billy gets a girlfriend and they start making out, she whispers to him, “You can put your hand in my knickers if you like.”
He says, “No chance, you’ve got teeth in there that’ll bite my fingers off.”
She replies, “Don’t be so silly, there’s no teeth up there….look!” and with that, she drops her knickers.
“Ha!” said Little Billy, “I’m not surprised, look at the state of your gums.”