I spilled boiling hot water on my hand when I was a kid (pouring into a cup from an old whistling tea kettle) and the whistle/stopper popped open at the wrong time and sent boiling water over the cup and onto the back of my hand near the thumb.

Before I knew what had happened, I watched as the skin literally peeled back with the water.....then the shock and pain set in.
I doused it in cold water, but the damage was done. I had to hold my arm in a sling for awhile until the throbbing pain subsided.
It's a pain I hole I NEVER experience again!