Accepting the Oscar for best sound editing for his work on “Mad Max: Fury Road,” Boston native Mark Mangini was understandably excited. But he regrets dropping an F-bomb, which he did, quite conspicuously, when he got on stage to accept the award. “I’m gonna hear it from my wife, so that’s about as big a regret as one can have,” Mangini told Entertainment Weekly afterward. Mangini also worked on “Black Mass,” director Scott Cooper’s movie about South Boston mobster Whitey Bulger. An interesting footnote: Mangini’s crew on “Mad Max” included Kira Roessler, who used to play bass in the hardcore band Black Flag.