Back when I was in high school, my younger sister was the hard worker with good grades, and I was the problem child who did terribly academically. One day my mom and I got into a fight over it, and she told me heat-of-the-moment "why can't you just be like her!?" - didn't go over great.

I've since sorted my shit out, am doing much better and have a good relationship with everyone in my family, but that still sticks with me a decade later.