The dumbest thing you've ever done while working on your vehicle?

[iceman1575]

First week I had my truck, I was cleaning my truck out, giving it a wash and vacuum, etc at the station. Pulled my truck out, left keys in truck, didn't roll window down, went back in to lock station door and close the bay door so I wouldn't have to lock the door by key, went to close the bay door and get in the truck, and of course locked myself out of the truck, and of course the station. Luckily the neighbors to the station were home, called my buddy to come let me back in the station, get the slimjim set out of the rescue truck, and eventually got in it. Learned my lesson that day.