I’ll go first: “You have to have children when you’re young,” told to me when I was in my late 20s, with no desire to ever have kids, and no means to support them, by someone divorced multiple times with at least one adult child who does not speak to them.
Also: Responding to “How do I deal with this problem?” questions with “Oh, don’t worry about it, it’s enough that you’re even thinking about it!”
For me it’s the opposite, at school I was forced to take notes. Teacher would give me bad grades if they saw me not talking notes. But notes are completely useless for me, and if I take notes I don’t understand the lecture. So I started the habit to sketch on notebooks pretending to take notes. Schools can be pretty stupid