Filed Under Seinfeld is Alive and Well: Cosmo Kramer Spotting Posted on July 28, 2012 by Queenie You know who Cosmo Kramer is on Seinfeld right? Cosmo Kramer.. Jerry Seinfeld's crazy neighbor. The other day I was driving up I-35 towards Olathe, KS… when this green Jeep Cherokee passed me. Does it look like Kramer to you?