One time when my family was visiting Utah from New Jersey, I joined a basketball game my cousins and brothers were playing. But I didn't know who was on what team. So when I had the ball and one of the cousins wanted me to pass to him, I did.

Turns out he was on the other team, and everybody who was on my team was upset with me.

After that, I switched sides. And I knew who was on my team - the cousins who didn't yell when I messed up earlier.