A few years ago I saw James Hetfield (of Metallica) pull a balisong (butterfly knife) on one of Weezer's roadie/bodyguards backstage in Charlotte (Atlanta maybe?). It was somewhere in the Southeast.
The bodyguard was standing there wetting himself as Hetfield is screaming 2 inches from his face about what he going to do with that knife. Total raving psychotic off his meds and out of the psych ward stuff.
Bell strolls over with his guitar strapped on because he JUST came offstage, calmly grabs the knife from Hetfield with the kind of dexterity only a lead guitarist that doesn't just play power chords has. He flips it closed in a masterful series of deft movements, glances at it, and then whacks Hetfield in the nose with it and coolly says "You shouldn't play with knives."
James grabs his nose and starts crying and Lars ushers him back to the room reserved for Metallica while muttering something about "ninja nerds" under his breath.
The roadie/bodyguard collapsed in a heap on the floor and just sat there shaking and crying while profusely thanking Brian for what surely had just saved him from being gutted like a catfish.
Brian dropped the knife in his lap and walked back into his dressing room without a word.
Everyone there was stunned speechless. Rivers came through the curtain right after that and seemed confused by how quiet and tense it was aside from the sobbing 350 lb man on the floor.
Brian is wicked fast and very dangerous.
Scott, He's a former Marine
Scott would win and Rivers would be the first to cry :P