My favorite is when the arrest everyone because "someone" called the cops. Even though neither want the other go go to jail, they just want them to knock it off.
So now they have to waste all kinds of money and tax dollars, go in front of a judge to say "neither of us really give a ****", when the cop could have just ended it there.
Another good one is when a cop got absolutely PISSED because the chicks boyfriend locked her out of her house. I mean, who the hell are you supposed to call then?