Comes from Obi-Wan Kenobi's use of an old Jedi mind trick on Stormtroopers in Star Wars Episode IV in order to help them avoid Imperial entanglements.
Bouncer: "Holmes, these aren't the droids you're looking for wit'cha pants on da ground. You gon' have to hang elsewhere tonight with that attire."
Steve: Um, these aren't the droids you're looking for. That's my girlfriend, dude. She just came to drop off my car keys. Move along!