From Dusk till Dawn/Fridge

Fridge Logic

 * After a little thought, it becomes apparent that Sex Machine's crotch gun is a terrible idea. Now, ignoring the fact that the cylinders cannot feed the gun the way they are positioned, it looks to be a pretty large caliber - if you were to fire that thing, you would pretty much be punching yourself in the groin.
 * Maybe Sex Machine is into that sort of thing?
 * It's a movie that features a working crotch gun, man, you're not watching it right.