I'm labeling this part 1 because I feel fairly confident that I will have a part 2 and probably even a part 3.
When people don't stop at stop signs.
Corollary: When people stop at stop signs, look, see that someone is coming, and go anyway.
Hint: It's not just, stop, look and go. It's stop. Look and see if the way is clear and then go.
I feel better now.