Had an idea a while back. It's so obvious that I'm sure it's occured to others but here goes. Against a black screen you hear the music from Star Wars. Then you see Darth Vader waving his light-saber back and forth. Cut to an over Vader's shoulder viewpoint. A guy in a TOS Starfleet uniform gives his best Indiana Jones smirk and vaporizes Vader with a phaser. Fade out to classic Star Trek theme. What do you think?