Disclaimer! This post is in no way shape or form to promote any negativity/Toxicity in this game what is the most evil thing you have done to another player or guild in this game just be honest.
Also state whether you do or do not regret doing it 
Confess thou sins and valhella shall purge thee!
Rolled need on transmog item.
Was in a random dungeon as tank.
I was basically healing myself through it as the healer was just not healing.
So i stopped and asked said healer if they would like to throw some heals my way.
One of the dps turned out to be the healers bf.
Started giving me extremely toxic grief over me simply asking a question.
So simply stopped tanking the dungeon /sit and told the dps guy to tank it if he wanted to.
They started trying to kick me but failed multiple times, eventually the healer left the group and that dps followed not before giving me multiple profanities, after they left i finished the dungeon with just me and the 1 remaining dps, we both had a good laugh about it and went our own ways.
Was in a dungeon that took forever due to bad players…
Got to last boss, three left because they couldn’t bother with tactics.
Got curious with the vote kick when only two players are left…
I still feel bad :<
Light bless you you have been redeemed
The worst thing i ever did was mass wipe a guild because someone who did not need ashkanduur rolled for it and got it and then tried to sell it to me for 600k gold.
I reported them got kicked from the guild and group but as a final act of redemption i pulled sarkareth and mass wiped them no regrets
killed hogger
Light bless thee
Oh god missed that part.
Sprays unholy water Begone foul inquisitor!
I flagged someone’s name during the prep / pre-countdown time in a Mythic plus run. We we are all prepping / eating and I saw a possible offensive name on my pug teammate so I reported it. Literally 2 seconds later the dude went offline. Was the most bizarre thing I have ever witnessed. Ahole move from me, but I don’t regret it because 9 of 10 times that name is worn by some toxic 12 year old.
https://imgur.com/a/J9vhOBH
Hahaha well some people do have controversial names dont they … Light bless thee
ooooo a couple. One would be the time I convinced my missus there was a hidden treasure chest in the huge forge in Ironforge but I also remember dealing with a level 1 gold beggar by telling him as long as he didn’t leave the sidecar of my chopper wherever I went he would get 50k.
Naturally he agrees so I add him to a party, let him in the sidecar and we race off around stormwind. A friend followed watching. I head to the harbour and activate path of Frost. I then head out into the water and into the fatigue zone which I had timed to the point that I could get back in time after a 180. So I get close to the point…
Deactivate Path of Frost…
Leave the party…
Dismount.
Quickly re apply path of frost and hop onto a flying mount.
With any luck the beggar’s corpse is still there…
That’s so evil, I love it 
Should’ve mailed him 1 silver after. Would’ve been hilarious to see his reaction 
Dir Sir,
Thank you for going on adventures with me. As a reward for your brave endeavors and being my loyal squire, here’s 1 silver. May our paths cross again.
Sincerely yours,
Souldefiler
I caused the collapse of a guild I was officer in because the guild master was hitting on my sister.
Hahaha that is some 200 iq cruelty right there extra light bless thee!
One time in vanilla I didn’t feed my pet for like an hour. 
They died back then if you did not feed them T.T how cruel bless thou soul tah.
I did a poop quest and didn’t wash my hands afterwards.
Dont worry if anyone seen the keyboard they would just think it was spilled coffee no need to clean keep playing
I crafted something to a Vulpera.
I know I know… I m still ashamed.
Shame on me.
Bless you vulperas are cute but not cute enough in your eyes no shame be purged.