Difference Between Stop, And Slow Down!

One of my grandpa's favorites So a man doesn't stop at a stop sign, and shortly after gets pulled over. Cop: Why didn't you stop at that stop sign? Man: Well I slowed down, didn't see anybody and kept driving. If you can tell me the difference between stop and slowing down I'll pay the ticket The Officer pulls out his nightstick and beats the man. Cop: Now do you want me to slow down, or stop?