Good God, LARPers.
Reminds me of a time when we were at the Renaissance Fair and people in Star Trek uniforms were in attendance claiming to be on the Holo Deck.
My favorite re-enactment story: A buddy who is part of the SCA told me about a time when the SCA, a pirate re-enactment group and a WWII group were in the same park or what-not doing their thing. The SCA and pirate folks were partying and having a great time, but the WWII folks where just quietly huddled in their tents. The WWII group was brought into the fun when the pirates ‘liberated’ one of the WWII group’s vehicles and drove it around whooping and hollering like, well, pirates.