[addon wanted] there is no addon that can show OTHER players' interrupts!
Back in 4.0.3. I tried about a dozen interrupt addons, but only one was able to show other players' and mobs' interrupts, complete with spell links and output selection (/party, /raid, /say, self, etc). Unfortunately, this addon (WhoInterrupted) was not updated for 4.2. and now produces lua errors when other players interrupt (your own interrupts are still displayed correctly).
If you know an addon that can show me when another player (or mob) interrupts something, please reply to this post, thank you very much in advance.
Shamelessly promoting myself and there probably are a lot of other addons that are made for specifically only interrupts, or also can show interrupts .. "Ketho CombatLog" can show interrupts done by other players