Seinfeld trivia? Which episode is it?

In one of the clip shows, there is a scene where Kramer is telling how he was on the bus and either he or the bus driver was attacked by a mugger. The bus driver was knocked out and Kramer was driving the bus while fighting off the mugger and kicked him out the door at the next stop becuase he kept making the stops since people kept ringing the bell. I've seen the scene on one of the episodes with all the different clips but I want to see how the story started with Kramer and the bus mugger.