Was home on leave from the Navy sometime around '73. Had to have wheels so bought a 59 TR3 that had seen better days, but it really only had to last 30 days then my younger brother could drive it forever if he wanted it. Anyway there was a serious clunk on every shift. Borrowed a floor jack and slid it under the pumpkin and got looking around found driveshaft was about to come off. So walked to the hardware store and returned home. Now my mom used to watch one of my nephews who couldn't have been more than 3 years old, and as I started to jack up the car again he came out of the house and asked a bunch of questions one being how the jack worked. And me being the indulgent uncle showed him how twist the handle etc... and let him try it. Then I placed the jack under the pumpkin and lifted it up. Now being probably about 20 and bulletproof figuring the repair was going to take just a few minutes did not use any jackstands. Yup, just me and the floorjack under the car. Just about then my nephew decides its time to practice some new skills. A quick twist of the handle and am pinned under the car. After a couple minutes he managed to pump the jack enough to allow my exit. Didn't raise my voice just walked him into the house and said he could watch and talk to me but it had to thru the window, and yes I did walk down to the basement and grab my jackstands.