I was removing just the engine from my Firebird one evening, had the trans supported with a floor jack and only had one more bolt to take out. It was the top bellhousing bolt behind the right head. I was just thinking that I had it made as I unscrewed the bolt the last few threads when all of a sudden the rear of the engine dropped, the trans slammed against the tunnel and trapped my pinky (right on the fingernail)! I had too much lift on the trans and not enough on the engine!
I had planned on pulling the engine at my usual time (wee hours of the morning) but luckily had started early enough that my dad was still in the shop! After the initial panic moment (thanks for reminding me Scott!), I realized what had happened and asked my dad politely if he would mind lowering the trans jack! If I had kept to my original schedule I would have had to wait all night for someone to notice that I wasn't showing up for breakfast and come down to the shop to release me!