I was just going threw the project section and i came across this: http://www.wowace.com/addons/headkillshot/
Then i got an idea for an identical addon for shamans.
Everytime you cast Sprit wolves you could hear a sound from the Bahaman "Who let the dogs out".
Useless scale 1-10: 9.5
Funny scale 1-10: 10:lol:
I think you can do this yourself by using either ScrollingCombatText by Grayhoof or MikScrollingBattleText by Mikord, where the latter is the most recently updated and most configurable one of the two.
I am not sure if you can add your own soundfiles but both addons allows you to set both a text output and a soundfile to a certain event.