Some of my fellow guild members and I were in a pug for ICC 25, and we were waiting for people to come back from AFK for Deathwhisper. Anyways, this one puggie realized that he was suddenly guildless (his guild was playing a joke on a few members) , and starts going on a RAGE in vent. So, after a plethora of insults to everyone, he uttered this jewel.

"Shut up before I put my f-cking fiST in your mouth"

Unfortunately, he wasn't very clear, so everyone heard

"Shut up before I put my f-cking fiSH in your mouth"

Ever since, that has come up at least once a day.