The meanest thing you've ever done?

[Cyanist]

Despite Nix's distasteful thread subject, he did make a good point (somewhere in there) about the lack of general chatting. So, here's a thread:

I'm responsible for an awful lot of stuff, but this morning my little brother was behaving obnoxiously and called me ricist for preferring white rice over brown. He then rather suddenly fell off-balance (divine providence?) and I punched his pot-belly instead of steadying him. I sincerely regret doing this

What's the meanest thing you've ever done? If you don't rightly recall, then what bad have you done lately? Confessions here