Via our pal Alex, we find that up in the parks of Mount Royal in Montreal, some SCA folk would dress up in armor and hit each other with nerf-swords.
For reasons to insane to go into here, some other folk decided to dress up as zombies-- and ATTACK THOSE PEOPLE!
What delights me, is that the zombies walked to Mount Royal. That's right. You could be sitting in your car, and suddenly zombies would be streaming across the crosswalk.
I can think of a few people who'd go from zero-to-freak-out in under five seconds.
(Make sure you follow the links to the flickr stream)