Three drukards!

Three heavily drunk men hire a taxi to get back home.  Knowing their condition, the driver demands a hefty sum which they reluctantly accept.  Acting smart further the driver starts the car and simply accelerates for a while in idle condition.  He then stops the engine and asks the guys to get down as the vehicle has reached their destination.

The first guy gets down and makes the payment without a word while the second guy thanks the driver and starts groping to find his way.  The third guy gets down and slaps the driver hard.  The driver is shocked that his trick has been found out and gets ready to apologize and return the money.  However he questions the drunkard for his rude behavior.  The drunkard says, "I have slapped you because your engine noise was unbearable and I was almost killed," and walks off.