In the mid 90's, I was building a gallows for a TV documentary at a Living History Museum. The job was cursed. I was working alone, after hours, with no-one to call for help. The job was to convert a saw pit, with a log frame, into a platform with stairs.
The first "oh sh*t" was while laying the rough cut 2x12's for the deck. I laid them all out on the top of the frame and climbed up to nail them in. The planks were various lengths and hung out off the frame to be cut off later. (don't get ahead of me, I'll get to it) I nailed the first two planks down and stepped back onto the 4th plank to start nailing the 3rd plank. (here it comes, you guessed it) Without realizing it, I had stepped outside of the frame and the plank I was on flipped up. I fell 6', sideways, onto hard gravel, knocked the wind out of myself, whacked my head, and blacked out. The last thing I saw was the plank plant itself next to me and flip over, just missing me.
The next day was the 2nd "oh sh*t" moment. I had just built and installed the stairs. Now I had to distress and age the new wood, so I could paint and stain the next day. It was late and I was running out of light, so I had to work fast. To distress the wood, I was using an 4" angle grinder with a wood carving blade (a disk with a chainsaw blade on the edge. (wait for it) To get the blade to fit, I had to remove the safety guard. After working for 30min, I realized that my hand on the side handle was fairly close to the bare blade. (not yet) This was dangerous (no sh*t!), I thought. So I figured that I'd better put on some work gloves. I turned off the grinder, took my hand off the side handle, (now you can cringe) and put my finger into the still spinning blade, taking the tip off nearly to the bone.
I was on a deadline, so I grabbed a roll of paper towels, kept pressure on it, and finished the job one handed, while trying VERY hard not to pass out. I never went to the doctor about it, I just took care of it myself. When I got home, with a ****** wad of towels in my hand, my family just rolled their eyes and went back to watching TV. For the next 8 months I would get teased about the big wad of duct tape on my finger, until the tip grew back.