At a LAN party I hosted, I'd typically demolish my friends at CS. So one time, unknown to me, they installed a hack on their side (aimbot?) and always started headshotting me. I remember getting flustered (I was and am a competitive person) and then just broke out laughing.
I remember attending a LAN party a friend was hosting (I couldn't bring my computer because it was a family computer but the friend had an extra PC) but because I would just demolish them, they switched my display to a projector that was projected on the ceiling. Still demolished them.