Once I carried a ginormous pair of scissors to the room where we keep our cat’s bowls so that I could cut open the food bags. As I walked out, the hand holding the scissors bumped into the doorframe, driving the blades into my gut. Fortunately, there was discomfort, but no penetration. “Phew!” thought I; “I’ll be more careful next time I’m carrying these scissors.”

Anyway, on my way out of the cat room, the exact same thing happened in reverse. Since then, I haven’t handled those scissors, nor inadvertently stabbed myself with any others.