I had said something a while ago about when I caused a fire on wire which was shorting out the RC. I have returned from the Buckeye regional with more hair raising stories.
Some scary things that happened to us at competition:
1) A loose steel cable fell across a battery, shorting it out and sending out a spurt of flames and a nice big mushroom cloud. It wasn't me, I swear! I was just the closest person.
2) While staying until 8:00 on Thursday, we managed to step on the tether (which was screwed into the RC). The snap was startling, but it was nothing compared to having the tether port on the ground.
Fortunately, we got a loan a RC from Innovation FIRST for the duration of the competition.
Throw in any of your own stories, if you think you can top ruining a $500 microcontroller.