Banned for using deodorant.

Banned, because we don't want to smell your terrible body odour in our forum, it's an insult to our olfactory senses.

Banned for using antiperspirant.

I ban both of you for acting like we smell each other.

Banned for acting like we ban each other.

Banned, for wearing your underwear inside-out when you are too lazy to do laundry

I ban you for doing laundry!

Banned for laundering bans.

Banned for forgetting to put detergent in the washing machine... so, now that you are banned, you'll have time to do that load of clothes again properly... spin it again!

Banned for treating him like your maid! Do your own laundry!

Banned because I used to stand for something, but forgot what that could be.

Banned, because you stand for nothing. You even offered your account to everyone freely!

Banned for not letting us know how much an account should sell for.

Banned for not bidding. The one of you who bids nearest to the retail price without going over the retail price, wins the account.

Banned for account trading! Speaking of ban-hammers I've used in Runescape, this one time somebody lead me to an empty farm and inquired (I guess because I was playing as a girl at the time) about the color of my panty-contents. The next day, Jagex gave me the most satisfying message that he's been dealt with.

Banned because something like this happened to me in Guild Wars 1. I was playing a female character and someone started hitting on me. I told him I was really a guy. He complimented my "joke", and went back to telling me how attractive I am.