I think that you are a deep well of blackness...<quoted text>
Never pulled this one off but sounds like a good one!
"The Balcony Bandit" aka "The Houdini" aka "The David Copperfield"
While having sex with your psychob!tch girlfriend from behind on a balcony slowly slide out and let your friend or any random hobo slide in and run down to below the balcony and wave to her. By the time she notices, she is having some hobo's junk all up in her!