I've got one that involves the entire staff where I work, though it was years ago and most of them have since moved on. We work at a small school, and midsemester, we got news that the governor was slashing state funding. This is after all the teachers have been in the classrooms for a while, courses are underway, all of a sudden we were in a very very bad position. We found out the plan was to cut one teaching hour a day out of our schedules, and cut our pay accordingly. Bad for us, but worse for the students who were going to have classes dropped mid semester, and maybe be able to fit another overcrowded section into their schedule - but maybe not. It was going to be a massive crapfest to try to clean it up without impacting the kids.
The teachers met privately, then we had the big meeting where the poor budget guy from the county had to come give us the news, and officially tell us what we already knew. We did a reverse strike, telling him we understood we didn't have a choice about the pay cut, but we refused to cut our hours, and every one of us taught one class for free for the rest of the school year. When we told him what we were going to do, budget dude broke down and started crying - he'd never seen a teaching staff react like that, and especially not down to the last man.