I do it to frustrate them because i know if i am bothered or frustrated i play like shit. Seems like my best games are when i am laid back not forcing the action but if i get tea bagged or some other reason to be "mad" i focus on revenge and i get pounded more often than not. So for me its about makin that person play like a loose cannon hopefully leading to bad decisions that get them killed. But I find myself doing it the most if someone misses a super or misses a shoulder charge and i kill them then smother them. Oh and also blinkers....HATE BLINKERS