What’s something wrong you saw your parents doing as a kid, but didn’t realize it was wrong until you got older?

My realized: My dad did this after softball games. One day he fell asleep and scraped the car into a guardrail before waking up. Then, a few blocks from home, he fell asleep at a stop light. I was just like "uhhhhh dad... the light turned green... wake up." We made it home unscathed but I never saw him drink and drive again. Mom was pretty damn pissed too and I know was talking about divorce but decided not to if he got his act together.