Wayyyy back in the days of vanilla WoW (when you had to get forty fucking people together for a raid)...
We were going to Azshara for some reason. Part of the Molten Core runup, IIRC-- Hydraxian Water Lords-- and as a "team-building" exercise we all stayed together. I was drunk and tired. And a shaman.
There's a big cliff you can jump off of down into the sea rather than running around the long way. I was also the first one down, followed by my wife.
Off vent, I say to her, "Oh, I'm about to do something to get /gkicked"
I globally mute the channel in vent
...and proceed to cast Water Walking on every, single, guildy as they jump off of the cliff. Piles of bodies and people are STILL jumping off of that cliff to their doom. The only person who didn't die was the Guild Master, who was smart enough to click off of the buff before he went splat. He probably guessed what I was up to, since he's known me for more than a decade now and is perfectly aware of my black and twisted sense of humor. (One of the funniest parts was seeing the icons light up in Vent as people are going 'WTF' or trying to warn each other.)
Needless to say, I effectively derailed the evening (it was late anyway). There was a lot of nerdrage going on guild chat for a while; some folks even threatened to quit if I wasn't booted from the guild, even though I offered to pay every repair bill. The GM ended up telling them that it was fucking hilarious, and that- in his opinion- if they were too stupid to not click off the buff, it was their own damn problem.
I spent alot of money fixing people's shit, tho.
I really shoulda screenshotted it. It was spactacular.