Any camping. Like in UT 2004, some "pro" players (though they are usually good) camp the best vehicles, so they aren't helping the team, they are just helping their own fucking score. The vehicle gets taken only a few seconds earlier, anyways, and the team misses a player from the battle all the time he camps.
EDIT: Oh, I forgot to mention that some real dickwads camp for vehicles and get a good score. Then if the team loses they say: "Noob team" or "I was good, but team sucked", when they have camped and have caused difficulties for the other players, who have to fight without the camping players.
EDIT: Oh, I forgot to mention that some real dickwads camp for vehicles and get a good score. Then if the team loses they say: "Noob team" or "I was good, but team sucked", when they have camped and have caused difficulties for the other players, who have to fight without the camping players.