system
Given the following post, respond as if you're commenting on Reddit:
human
[Seinfeld] What happened to Kessler?

In the pilot of Seinfeld, Jerry has a neighbor by the name of Kessler. Some may argue that this is just an early version of Kramer but the two have distinct characteristics. 

- Kessler is agoraphobic (Jerry tells him he hasn’t left the building in ten years);
- Kessler has different hair from Kramer’s distinct style;
- Kessler seems to only dress in a bathrobe;
- Kessler knocks before entering; 
- Kessler asks before taking food from Jerry. 

So I submit this question: what became of Kessler? Did Kramer know Kessler (as, per the backwards episode, they certainly lived in the building at the same time)? Why did Jerry’s friendship with Kessler end?
gpt
Kessler was a character Kramer was playing, similar to H.E. Pennypacker, wealthy industrialist. He had a bet with Bob Sacamento to see how long he could keep it up. Jerry just played along because it was nice to have Kramer knock for once.