Ladders. Treat them with great respect, especially the 24 foot extension type I have to use 4-5 time per year to clean out second story gutters. But only two accidents that really hurt were landing on aluminum ladders after falling...First time after some beers (stupid, stupid) on a little 8 foot aluminum ladder checking my hillside foundation after the Northridge earthquake . Second time while pruning. The branch I was pruning was lightened slightly and pulled away, sending me down, down, down. I hurt too bad to get up and walk so crawled across the yard hoping no neighbor saw me. Yeah, just like the 3 stooges movie. Nothing but pride hurt, but could not really feel anything for a long time on the second one.