When I was a child, my parents and I went to the mountains. I was throwing rocks into a lake. Not paying attention, I grabbed another rock only to find that it was actually a hot coal that had recently been dumped from a grill. Even though this was nearly 25 years ago, the pain was great enough to change my behavior. I'm cautious when I pick up a rock or a stone to this day. The pain that I felt that day created an instinctive reaction that will protect me from ever making that mistake again.