In the past, I once had a baking potato explode while in the oven. I was making a bunch of them so it's possible that I had missed piercing it, but it might also have had to do with it being on the rack in the rear corner of the oven. Maybe too much heat. Long time ago so I don't know how high or for how long. The others were fine.
Today I (definitely) pierced two room temperature Russets with a fork and placed them directly on the oven rack at 300F for maybe 90 minutes. At the end of that time, I reached my bare hand in for the closest one, and dropped it onto a plate perhaps 10" below it. It exploded, spreading potato shrapnel in a 2ft radius. The skin, though ruptured, was still in one piece. It had flown back into the oven. I left the other potato in the turned-off oven until it cooled off a bit.
Has this happened to anyone else, or can anyone explain what happened?