10 years ago at my dad's place, working on my MGB. One jackstand slipped, then the other toppled over and I got pinned under the car. Luckily, the side of the jackstand took the weight but I was mashed under there pretty tight. Garage door was closed, dad was away for 2 weeks.
People sometimes say that in situations like that, you get an amazing calmness... a sense of deliberation to think clearly and get out safely. Bull$hit. I screamed and flailed like a panicked child, convinced I would die there. I only calmed down after exhausting myself, and was able to wiggle my floor jack over and wrestle it under the car, right by my armpit, and awkwardly jack the car up enough to peel myself out.
scary scary scary
Since then, I never get under a car until I go to each corner, SHOVE HARD, and feel the car is secure. That saved me a couple years ago when I was working on my neighbor's '72 VW bus. I had the front up and was about to get underneath to work on the shift linkages. I got the van onto stands with the wheels off, and then walked to the front and gave it a hard shove to make sure it was solid.
I heard a "PING", and then it wobbled a bit. I crouched over, and pushed the van as I looked. On one of the stands, two legs would wiggle; the other two stayed in place. I turned around to get the jack, and the whole works came tumbling down. Glad I didn't get that in the teeth
