[kamocat]

I was driving the robot at a demonstration, and the Victors were in coast to make the driving a little smoother (we had really bad driving code that year, with no speed scaling whatsoever). It was heading a little fast towards us, so the other driver hit the E-stop. Unfortunately, E-stop wasn't wired to switch the Victors to brake mode, and it almost hit our table.
Lesson: while E-stop prevents you from moving the robot, it also prevents you from stopping it.

Also, during a test of a Victor, I supplied power to the wrong side, and blew out one direction. (it was unfused, but it probably would still have happened with a 40A fuse). EVERYTHING should be labeled and color-coded (nail polish works well. A dab of white on the fan blade also helps tell if it's moving or not).