A man was driving when a policeman pulled him over. He rolled down his window and said to the officer,
"Is there a problem, Officer?"
"No problem at all. I just observed your safe driving and am pleased to award you a $5,000 Safe Driver Award. Congratulations. What do you think you're going to do with the money?"
The driver thought for a minute and said, "Well, I guess I'll go get that drivers' licence." The lady sitting in the passenger seat said to the policeman, "Oh, don't pay attention to him - he's a smart driver, but only when he's drunk and stoned." The guy from the back seat said, "I told you guys we wouldn't get far in a stolen car!"
At that moment, there was a knock from the trunk and a muffled voice said, "Are we over the border yet?"
If you are stoned, you are feeling the effects of illegal drugs.
A muffled voice is one that it is difficult to hear clearly.
The joke here is that the man has been driving safely and is about to get $5000 from the police, but then he and the people in the car are so stupid that they reveal five crimes that are being committed.