In the spirit of the Priest Memories thread. Post your most treasured shaman memories!
The big one (kinda literally) is probably the two-handed windfury goodness during vanilla. I actually leveled my shaman as elemental initially, but in the late 30's I respecced to enhancement, got myself some sweet mail gear from Scarlet Monastery, and was lucky enough to get the super slow two-handed mace from the last boss in Uldum. Shortly afterwards I had a world PvP encounter with an alliance questing group near Stromgarde in Arathi Highlands. I obliterated the entire team with windfury procs.
During vanilla I also used to go on bot hunting sprees in Azshara, since it was a popular bot farming spot with the furlborg camps. I would kite them north and jump down the cliffs towards the ocean, and then lure them out as far as I could with water walking.
There was also a brief period during WotLK when an oversight was discovered where you could attack players from your own faction by timing your fire nova totem just right with logging out. Shamans in both horde and alliance used this newfound knowledge to destroy the gold spammer pests in their capitals. For a brief period before it was hotfixed, the spammers knew fear.
Oh, and remember when being in ghost wolf form would make you immune to sap? Take that, rogues!