Tell a girl it's your fantasy to lay pipe from behind with her tits pressed up against a window. During the magic act, grab a handful of hair and force her nose into the glass, keeping her head straight and her face gazing stupidly out the window. Tell her you're gonna finish off balls deep in her ass and pull out giving her a brisk slap on the ass. Now instead of you putting your dick in her ass, have your buddy who was on stand by, jerking off in a dark corner of the room, violate her rubber cheerio and take your place. Then walk outside in front of the window and wave to her. How could one not be impressed by this magic trick?