(When you couldn't just kick people out of raids).
Go AFK and never come back, stopping the raid (Kara) from being able to bring in someone else.
Demanding people to have achievements before they can join a group and do what is necessary to get said achievement is also an ass move.
Did someone say [Thunderfury, Blessed Blade of the Windseeker]?
mounted on my mammoth and standing inside the little fountain in dala ah well so much hate in that one hour
Using leap of faith when someone wants to capture the flag so you can get it instead!
When you look long enough, Diglett's nose turns into a mouth with 1 tooth!
Train Set on Ultraxion. Oh, the memories..
Disclaimer: The majority of my posts might be dripping in sarcasm. Don't take everything I say literally.
cast Ancient portal to dalaran in any raids and ask if anyone wanted a portal..... watch how many people fell to their deaths.
used to lifegrip people on hagara during ice waves and watch them get killed.
put on aspect of the pact during lightning phase or during aoe dmg.
put hand of protection on a tank when he needed to taunt the boss.
Back when DS was the only LFR and groups had problems on spine. Kill all the tentacles!