<human>: Inspired by ssoo's thread:

When I was young, my parent's goto was this very thin but very strong bamboo stick and The Flyswatter. 

Its been a long long time since I've been spanked, but I was a pretty insolent kid when I was young. So spankings were pretty frequent. However, the most effective thing my parent ever done to me was when my father cried. 

I was 20 when this happened. My parent and I had a huge fight over something I don't even remember anymore. It was probably a whole list of things that compounded together. All I remember was my father being so disappointed in me that he started crying and blaming himself. 

Till then, I've never seen him cried before. It absolutely crushed me. The realization that I was such a goddamn turd to my parent came to me full force all at once in that one moment. So yeah, what was the most effective thing YOUR parent did to you to teach you a lesson?

Can you summarize the given text in a few sentences?
<bot>: What did your parent do to punish you that was effective? Mine was, "SON, I AM DISAPPOINT *TEARS"