30-something years ago, recently married, and we hadn't gotten used to each other's habits, yet. One habit of hers, was to ALWAYS lock doors. One day, I was mowing grass in the back of the house, and she left out the front, locking me out of the house. Upon realising that I was locked out, I lost my temper, and after a few minutes of silent ranting and raving, I decided to make what use of the time that I could.
I needed to replace a leaky rear transmission seal in my pickup truck. I had the new seal in the truck. My tools were in the truck. The truck was unlocked. Truck was parked on the street in front of the house...pointing uphill. I slid under on the curb side, and started removing the driveshaft. Still furious about her locking me out of the house, it didn't occur to me that the parking brake wasn't applied, (automatic transmission) and the only thing keeping it from rolling away was that the transmission was in "Park". So, after removing the U-bolts, I couldn't pull the rear universal joint apart. (the torque caused by the weight of the vehicle wouldn't let it move.) So, I gave the shaft a good yank, and out it came! That's when I realised that the truck was rolling away, with me under it! If you want to see a fat man move, you should have seen me scrambling backwards up over the kerb on my back! Then I ran around the other side of the truck, opened the door, and stepped on the brake, stopping the truck about 4 inches from my neighbour's car...and at an angle, halfway into the street! (This is the point where I looked, sheepishly around, to see if anyone had seen what I'd just done!)