Link: World of Warcraft: Crystal Water and You
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Link: Teamwork
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Originally intending "to have my character look like less of a dork," a user was messing around with game textures and suddenly found his character was nude. Hilarity ensues.

Also..

The lyrics to this are hilarious, especially if you play the game (the end of the video's funny too)..
Link: WoW is a Feeling

Link: World of Warcraft
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Leeroy Jenkins
This video's been around, but I was just adding a new category for "World of Warcraft" when I remembered it; I went looking for a link and was surprised by just how big it has gotten. Here's some fanfare.
Link: Leeroy Jenkins