Worst burn...welding up a trailer frame last year. It was early fall and I took my long sleeve shirt off about mid-morning when it got hot outside. Left my T-shirt on. Welded most of rest of the day and well after dark. Knew it was getting red and tender but I just had to get the trailer done.

Burnt the inside of my left upper arm to the point of no return. Blistered, Peeled, turned yellowish nasty and will be discolored to remind me from now on. No bodies fault but my own, knew better did it anyway.
Most Humorous near miss, At a recent demo I had a nail stick in the header. I heated the nail and header up, stuck the header in the vise and went to cut the head off the nail with a chisel. Smacked the chisel, the nail head seperated from the nail and promptly went down the front of my Bibs. Didn't take long to figure out what happened. leaned as far forward and down as I could, dropped the Galleasses on the bibs and fished it out before anything important got burnt.
John