You're a dumbass who doesn't know they're the same person.
Guy 1: Hey, remember the Anakin and Vader fight?
Guy 2: Uhh... What?
Guy 1: The Anakin vs. Vader fight, dude.
Guy 2: Umm... You do know it is the LUKE vs. Vader fight, right?
Guy 1: What do you mean?
Guy 2: Nevermind.