Each One Teach One
You learn something and then you're forced to explain it to someone else like they're a dumb kid who just fell off a cliff.
I learned how to solve a quadratic equation and now I have to teach my sister or I'll get grounded.
I got a C on my test and my teacher made me explain it to the whole class like I was a clown in a math circus.
My friend failed the test and now he has to teach me the lesson he didn't get, and I'm not happy about it.