ULPT request-Ways to subtly inconvenience a horrible person without being outwardly cruel

What are some ways to mess with someone that is at a distance from you? Ex: sign them up for spam mail, glitter mail, etc.

TW: SA

I’m not looking for any responses telling me to grow up or that I should be the bigger person. I already know this. This person did some horrible things to my unconscious parter and at the very least I’m looking for revenge ideas to think about the idea of doing without actually doing it