I.e. when you get someone so upset that they log on an opposing faction alt to rage at you.
Example: there was once a little gnome mage called Fizzey(). He was a strong pvper especially vs afk rogues at the blasted lands quest hub. After ~7 deaths he came at me with a brutal counterattack/meltdown:
Share any similar stories you have!
EDIT: The story of Fizzey, the furious gnome mage continues!!
Came back home to an interesting message in my mailbox
I ignored this but within an hour....
Fizzey trying to save face in another embarrassing message, while confirming his identity. I ignored him - not for long because he strikes again within 5 minutes with another lvl 3 horde alt:
I have to admit, I was really amazed how utterly hypocritical and without any trace of self awareness this guy turned out to be. I ignored him again, but this time, instead of making a new alt, he spent the next ~30 minutes whispering people from my guild with more whining about my "bad behavoiur" (rofl) and when they laughed him out or ignored him, similar insults as above.
Fizzey, the gnome mage everyone!