One time when playing Halo 3 over system link with my brother and my sister:
Valhalla - FFA:
Brother is about 20 foot away from sister, I'm on the other side of the map with my sniper rifle - he starts shooting her with his pistol (He'd just spawned and had no other weapon) - she had dual SMGs - she starts shooting, but doesn't know where he is - so shes blind firing and me and him are pissing ourselves because shes just shooting in the wrong direction - anyway he carries on firing and then my finger slipped on the right trigger - and bam, I won the match because I sneezed and stole the kill from my brother - funny but unsatisfying
Valhalla - FFA:
Brother is about 20 foot away from sister, I'm on the other side of the map with my sniper rifle - he starts shooting her with his pistol (He'd just spawned and had no other weapon) - she had dual SMGs - she starts shooting, but doesn't know where he is - so shes blind firing and me and him are pissing ourselves because shes just shooting in the wrong direction - anyway he carries on firing and then my finger slipped on the right trigger - and bam, I won the match because I sneezed and stole the kill from my brother - funny but unsatisfying