Shutupfool

Shutupfool plays a "shut up, fool!" sound when you successfully interrupt any player's spell cast. There is no effect for interrupting mobs, this is a PVP addon. There is no configuration. It works for kick, counterspell, silence, rebuke, skull bash, and any other directed interrupt.

Why? First, because it's funny as hell. Second, because often in the heat of pvp you aren't sure if your interrupt connected or not. With this addon, you get positive audio feedback on your successful pvp interrupts.