Not a particularly weird one, just annoying for others around me. I get very, VERY angry when I lose at a game for reasons beyond my current control, i.e. lag from my wireless adaptor. This is expecially true in TF2 which makes an active point of telling you you suck when you die, with the whole freezecam, dominations, first to get a kill on arena getting five seconds of crits etc. I nearly broke my screen before since I punched it so hard when it lagged whenever I got in enemy sight.
And when a death occurs without me lagging or anything, I'm very cool and calm about it, enjoying seeing my gibs thrown around by a Demo's stickies or whatever else kills me. ^_^