best way to piss people off in games.

[Hurr Durr Derp]

Sing in your headset. Constantly.

 

[Zorg Machine]

own them, fair and square. especially if they know you did it without cheating.

 

[omega 616]

Be a useless engineer that jumps into the gunner seat of a damaged vehicle instead of repairing the bloody thing.

EDIT: Oh, oh search for 'spermcube' on YouTube. His videos are funny to watch even if he is a griefing dick.

On a similar note, people driving away from you while you try to repair the vehicle.

Theres also been a number of times the guy has camped in a tank, when theres nothing happening near him. Then when there is action kills 3 dudes then drives off leaving me desperately trying to cut down the other 5 guys (or atleast spot them).

 

[Wolfram23]

#1 Team kill repeatedly

#2 Go after just one enemy and kill over and over and over

#3 Be generally annoying with spam or constant babbling/singing/playing music on a headset