Jerry: What's with you?
Kramer: I got a stone.
Jerry: What stone?
Kramer: A kidney stone.
Jerry: What is that, anyway?
Kramer: It's a... It's a stony mineral concretion, formed abnormally in the kidney. And this jagged shard of calcium pushes its way through the ureter into the bladder. It's forced out through the urine!
Jerry: Oh, that's gotta hurt.