This is the by-product of members from two guilds on Smolderthorn that farm Kel'Thuzad in 2 nights and have absolutely nothing to do for the rest of the week. Everyone thought 4-man onyxia would be the record until Burning Crusade and that 3-man was unthinkable. Well, think again.
Kylista - Warrior of Exo
Malican - Paladin of Transcendence
Tsuaxesis - Hunter of Transcendence
No fear ward, no gimmicks, just skill and slice & dice.
Note: This was done at level 60 before the release of The Burning Crusade. The date at the end should also state 2007 instead of 2006 :P.