Stop or Slow Down

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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 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 beat the guy with-out mercy.

COP: "Well, do you want me to STOP or SLOW DOWN?"