Cosmo Kramer is Jerry's crazy neighbor across the way in his apartment complex.  Krmaer is a ridiculous human being who is constantly known for barging into Jerry's apartment and eating all his food.  Though Kramer never has a steady job, he is constantly scheming throughout the series whether it's making a coffee book about coffee tables or co-creating the Bro with Frank Costanza.

Cosmo Kramer Quotes

The carpet sweeper is the biggest scam perpetrated on the American public since one-hour martinizing.

Kramer

Punk Dude: Hey Kramer, have you ever killed a man?!
Kramer: What do you think Junior? You think these hands - they've been soaking in Ivory Liquid?

Seinfeld Quotes

I'm disturbed, I'm depressed, I'm inadequate. I've got it all!

George

The carpet sweeper is the biggest scam perpetrated on the American public since one-hour martinizing.

Kramer