Banned because there was a contest for that, and I guessed it was the dog. My reasoning is that they would make it the least likely character to do it. My logic was sort of right but the guess was wrong.

Banned for no reason at all.

Banned, because according to astrological advice, it's best for you to get banned today.

banned because today is a banner day for banning

Banned because every day is a ban day.

^ banned for banning bands on banner ban day

Banned for over-alliterating.

Banned for over-taxing my little brain.

Banned because I filed my taxes over a week ago and still did not get my return yet.

Banned for returning void.

Banned for assuming I wasn't replying to you, and FYI, I ALWAYS go postal in Postal 2!!! I play golf with their heads using a shovel!!! HAHAHA!!!

Banned for replacing the return key with the enter one.

Banned for switching WASD with the arrow keys.

^ banned because WASD is not in the dictionary

Banned for spreading lies and/or not checking if your claim was true.

https://www.urbandictionary.com/define.php?term=wasd

Banned for performing a polygraph test.