Seinfeld fans : what is the episode when, jerry leaves and kramar rides a bike and stuff, befoe he returns?

Question

kramer does weird stuff like ride a bike, pretend to be jerry in a stand and stuff like that, and when jerry returns, the apartment is perfect, except that the drink does not have a coaster. what is that episode?

Answer 1

"The Bookstore" from the 9th and last season. It was the teaser clip right at the very beginning of the episode.