Drunk on a bus

A drunk gets on a transit bus. The driver, impatient while the drunk fumbles in his pocket for change, drives off. As the bus starts rolling, the drunk reacts to the sudden movement by stumbling all the way to the back of the bus. The bus stops at the next stop. He reacts by stumbling to the front of the bus. Still the man is fumbling in his pockets for change. The bus jerks forward once again, and the drunk stumbles uncontrollably to the back of the bus. Next stop, the same thing happens. Every time the bus stops, the man would stagger to the front. Every time the bus starts, he staggers uncontrollably to the back. A few stops later the drunk exits the the bus from the front.

"Hey", shouts the bus driver... "You didn't pay your fare yet!"

The drunk, reeling, shouts back "And I'm not going to!..... I walked all the way!"