OK, yeah, so I keep reposting stuff that Dvorak is posting, but there's a lot of great stuff.
A bunch of college kids forced people to go the 55 mph speed limit on an Atlanta freeway. For all of the impatient assholes that can't give me the chance to pass safely at 10 over the limit, I would thoroughly enjoy this. Here's the video, which is also funny.
Some coal miners tried to do the same thing on the Washington, D.C. beltway back in the early '90s during morning rush hour as a form of protest by the union. If I'm not mistaken they were driving below the speed limit and were given tickets for it. In the end, they didn't win any support for their cause and one or more of them could have wound up dead or killed by a disgruntled Fed.