This is going back to the USSR. In those days of pre-helicopter parenting, we were basically released into the street in the morning, and would just return when hunger overcame us. Anyhow, I think I was about 8 or 9 when we came across some roof tile (these were big wavy sheets made out of clay or some sort of "stony" material). So, the next logical thing was to start a big bonfire and see what would happen when you toss a tile "sheet" into it. Well, it was super exciting because, once the material got super hot, it exploded like a grenade. Let's throw some more in! But we better stand back 12 feet just in case. I felt that last piece of stone brush my hair just by my temple.
So, 1" from a Darwin Award.