I was about 12, and my mum picked me up after school. My younger brother was still playing on the swings and my mum was down the road chatting to a mate, so getting bored, I decided to get into the car.
I got in the back seat (car was empty and all doors closed), and closed the door. Only problem was that I closed the door by putting my opposite hand through the slightly open window and pulling on the top frame, slamming all 4 of my fingers in the door from the outside in the process. The worst part was that the car had automatic windows, so I couldn't wind them down to shout for help and the child lock was on, so I couldn't open the door. I was stuck like that for about 10 minutes until someone heard me screaming and called my mum...
I had purple dents across all my fingers for about 3 weeks and cramps in my shoulder from being in such an awkward position for so long....