I was commuting between my job and the local college, about 50 miles round-trip each day which wasn't too bad. At the time I was driving a Jeep Cherokee sport that was afflicted with a terrible case of falling apart due to rust, and things were just beginning to go from bad to worse on that hunk of junk.
I was heading to school after work one day trying to stop at a red light when my brake line blew out, causing me to blow through the light horns blazing and lights flashing to try and warn everyone else I couldn't stop. It was a standard 5 speed so I was able to downshift and slow myself considerably before turning into a large retail parking lot and drifting to a stop in the back of the lot. I had given my family a call, at this point it was SOP to bring the only truck and trailer we had available to pick up the jeep when it broke down. It was an F550 with a backhoe pro trailer that sits about 3.5-4 feet off the ground, and it had a large steel kick plate style lip at the front of the trailer near the hitch. We drove that jeep up on the trailer and it hit the steel kick plate, started rolling up, and juuuuuust missed going right over the top of it before it settled back down on the correct side of the trailer. I had helped chain the thing down, bind the chains, and was exhausted sipping on a bottle of snapple I bought while waiting for help to arrive.
I took one step backwards without looking, caught the back of my ankle on a chain (or more likely, the kick plate at the front of the trailer) and fell right off that trailer flat on my back on the pavement. My drink got tossed next to me and shattered on the asphalt parking lot, lucky for me it didn't end up beneath me somehow while I was trying to break my fall, I think I threw it as I was going down. I had a giant welt on the skin over two or three of my vertebrae where I landed.
We towed the jeep home, I got in my parent's Mazda B, and I drove to my night classes for 4 or 5 hours before heading home. My back was still bleeding from the fall, and my head probably hurt too but I don't recall that in much detail.