Stop and slow down joke

A guy is driving down a deserted highway. He pulls up to an intersection, and rolls through the stop sign. From out of nowhere, a cop car pulls him over.

COP: Do you know why I pulled you over?

GUY: Hey, I slowed down, didn't I?

COP: You must come to a full stop at the sign.

GUY: Stop. Slow down. What's the difference?

The cop pulls out his baton and starts to pound the man without mercy.

COP: Well? Do you want me to STOP or SLOW DOWN?