WARNING: THIS IS 10MINUTES OF ME ON MY FLYING MOUNT. GO SOMEWHERE ELSE IF YOU WANT PVE/PVP
Cataclysm came, and it brought flying mounts to whole of Azeroth.
Oh god how I miss the old wall-climbing days.
This bug has been known for a very long time, but I havn't seen anyone use it properly yet. Just to get into the "WMK chamber" in orgrimmar. You can basicly get anywhere with it.
-Deepholm (outside and above)
-Flying green cheese
-Ghostcrawlers face after nerfing classes
..and some more.