I've also done too many to list, mainly involving electric shocks until it finally dawned on me that going carefully was trumped by turning off the power!
But the one that freaked me out the most was shoving with all my might to push out an old tree stump. The top snapped off and I fell over the jagged remnant sticking out of the ground. I was in a press -up position with the stake pressing onto my chest quite hard on my left side. It was an isolated location and I wouldn't have been found for days if the thing had broken off a few inches higher.
