Cops are people too and when they walk up to your window after pulling you over, they may actually be scared. And you know fear leads to anger, anger leads to hate, hate leads to your suffering in traffic court.
So the next cop who pulls you over, wind down your window before he gets there, get your drivers license out so you don't have to fish your pockets, put your hands on the wheel so he can see you're not going to blow his brains out and if it's not more than 20 miles over the limit, try admitting guilt and being nice. You might be surprised.