There is a circular mark. It’s about the size of the head of a pin, and it is the result of function testing an air brad nailer without disconnecting the air.

The nail went through the tip of the thumb and out through the nail. I said some bad words. This has been… thirty years ago? Anyway, the nail won’t ever grow properly again, but the little callous that forms on the scar is like a stylus for my smartphone.

I’m not suggesting everyone do this, but it has been a convenience to me.