My niece loves werewolves, to a nearly terrifying degree. She told me she thought it would be "SUPER AWESOME"* if there were an addon that played a werewolf** howl sound*** upon entering combat.
Sound is set to play in the master channel, so you can still hear it, even if you have your other sounds turned down.
*Yes, she speaks in ALL CAPS.
**Werewolf, in this case will be Worgen.
***This was the howl she chose, out of the options I found.
If you have a preferred worgen howl sound ingame, please let me know, and I will try to find the script. I may make a random howl sound addon.