Ok I have one that my little brother did.

If you look at Mike today you can see a faint circle scar on his forehead. (sadly I can find a pic where you can see it)

Back to the story:

When Mike was a little, maybe 2 or 3, he was playing in his room being quiet. All of a sudden he started screaming! Mom rushed in there and got him quiet and calm again and found out he had burnt his forehead. How, I hear you ask. He wanted to see what was inside the lightbulb while it was on and pressed his head against it.