One time, I was at the park, eating a sandwich, when this minivan pulls up and I look over and its some dude in a freaking medieval hood staring at me in the driver's seat. He all gets out with his friend who's dressed like a cat and they start fighting with fake swords. I called everyone I knew to get them to come down and watch.
I believe this was an example of what you refer to as "LARPing."