Fandom really takes themselves very seriously and sometimes it is fun to have a little sport with some over zealous fans. So what are some things you do to mess with other people.
To Star Wars Fans I saw a couple things. When someone mentions Vader I go "Oh he is the boss of the Clone Troopers right?" I call R2 D2 and C3po Robots over Droids. I call Chewie Space Bigfoot. I call Lightsabers Laser Swords. I call Admiral Ackbar That fish guy and quote "It's A trick!"
For comics I call Spiderman that bug kid that takes pictures for The Daily Planet and wonder why he and Superman do not team up more.