Well
I've sent an innocent man to prison
I broke my parents heart by avoiding all contact with them completely
I've told a girl I know that she should kill herself, and she almost did (later we became friends

).
I outed my ex bf to his father (with proof) and he beat him up good
I sold my sister's favorite pets and she got depressed for like 3 weeks

I helped in wrecking one of my high school teacher's car because he gave us a hard exam

Recently I trashed and made fun of the actual pictures of a guy who catfished me. I guess I completely shattered his self esteem because he unfriended me yesterday
I'll try to remember the rest later