While funny, note that it's completely staged (which in a way makes it better). Their "tactic", while seemingly sensible to someone who might not have experience with World of Warcraft, is actually suicidal.
Don't bother with just a .wav, watch the real deal. If this link breaks, google should suffice to find another link.
Leeroy! Things to make note of, and info for the non-WoW player:
--Note Leeroy sitting in the corner, with an AFK tag up
--"Devout shoulders" are cloth; Leeroy is a Paladin which (normally) wears Plate armor.
--"Divine Intervention" kills the person who casts it, and prevents the recipient from doing anything for 30 sec. Listen for the mages to say "I'm lagging! I can't AE!".
--They are in a location known as "the rookery". You do not have to destroy all the eggs to do this.
J_A_B