If you haven't already done the Leeeroy Jenkins even in UBRS, I highly recommend doing it. If you normally play with all sounds other than GTFO and DBM/VEM, I recommend turning up the game sounds for this event. If you haven't seen the full Leeeroy Jenkins video where Leeroy mentions having chicken, I also recommend seeing it before doing the in-game event. Here is a fun "Know your Meme" video on one of the more recognizable WoW memes to date.
I'm a little surprised that the great "more DoTs" Onyxia wipe didn't reach the same level of meme-hood. Perhaps because of all the cursing -- would be hard to turn that into a Jeopardy question.