It's a little dark, but our banner is from an event I was a part of about a year ago, in WoW. A dear friend of mine, one of the officers of a Horde guild called the Twilight Guards, conceived the notion of a special raid. There's a tailor pattern to make blue overalls, and the idea would be to get the tailors in the guild to make overalls for everyone, don the overalls, grab fishing poles, and head for Alliance territory.
Some intrepid individuals even donned floppy hats, though this wasn't neccessary. I wasn't a member of the guild, but was a friend of the organizer, so I hopped onto a gnome char to meet them Alliance side (and report back on the reaction of the other side).
The raid went off as planned, and was great fun all around. The point wasn't to fight, or taunt, or get revenge, the point was to go have fun, and see who would be silly enough and open minded enough to join in. One thing it highlights is the variety of roles in a community- rare individuals who can come up with wacky events, like my friend Qat, and get people all excited by them, are jewels, leaving a string of emergent game-play events in their wake, as well as creating a lot of fun connections among the people who have helped create them. And, of course, the culture-jamming aspect, the confounding of the expectations in an MMOG that's done an amazing job of creating really rigid cultural behavior, just shows how much people want to contribute to their own experience. Of course the Alliance folks had reactions across the landscape: befuddled, angry, or joining in the wackiness and dancing along with the Twilight Guard in their spiffy blue overalls. I think it was a great event all around: creative, unexpected... and fun!