The stupidest thing I have ever done...
When I would tow my race car to out of town tracks, I would chain and lock my car to the trailer. On time I loaded up my car the night before I was leaving. Drove from Baily CO. To Topeka Ks. For a race. 500 plus miles. Payed my entry at the track, went to get my car off the trailer, car keys, and keys to the chain and lock were at home on the kitchen table.