Alright, so this is something I am guessing has happened to everyone, but hey, maybe a couple people have gotten through life so far without ever grabbing the hot end of a soldering iron.
I know it's happened to me three times so far, possibly a couple more that I can't remember, but it always leaves a familiar feeling blister that is sure to form. Last time for me was a few months ago when I was fixing my a cheap laminator I got, I was distracted, listening to music, multitasking, and grabbed the hot end, it was not fun, and I couldn't believe I did it, it seems like such a rookie mistake.
At least I got it on video since I was recording the process, unfortunately (or perhaps fortunately) my channel isn't popular so I not many people laughed at my noobery.
So, when was the last time you burned your hand with a soldering iron? What were the circumstances?
Another fun (but much rarer I think) situation is when a ball of hot solder flings off or drops leaving a round indent in your skin for a while. That's only ever happened to me once.