An online magazine made a post about the 7 most Catastrophic moments in WoW's history that was a fun little walk down memory lane. If you haven't been playing long, it's got videos, so it's a good history lesson on some of the big events--or rather, big problems--players have faced, in terms of bugs, lag, concerns, and "working as UNintended."
My favorite was the corrupted blood incident from Hakkar, which was somewhat replicated on a smaller extent from Vaelestrasz' bomb in BWL. KABOOM.
Resto druid updates for Draenor
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