One snafu I was personally responsible for involved a 4-wheeler using Soap Box Derby wheels:
I had fabricated covers for the wheels, within which were heating coils. When prepping the buggy in the tent, you merely plugged it in and kept the wheels slowly turning. Then you carry buggy to the starting line, still plugged in, and a few seconds before the start, unplug it. The problem was the covers didn't fit right and the vibration loosened the heating coils, which got tangled in the wheels. What a mess.
* "I love the smell of solvents at Free Roll. It smells like......victory".
* "I'm loosing my mind, but I don't seem to miss it much."