Have you found the Shiny Dinglehopper? Have you seen
the Sea Giant fart and then try to pop the bubbles? Do you have a pet chicken yet?
If you think I am crazy and I have no clue what I am talking about, I would advise you to check out the WoW easter egg text file!
I would highly recommend combing through the file a bit; there is some funny stuff in there! I know I will be running the chicken quest soon - stay tuned for screenshots...
[Edit: As GameFAQs doesn't allow direct linking, here's a link to a list of FAQ's including the WoW easer eggs one. You can get there from here.]