You see, it's a pun on bilirubin, which is the compound that breaks down heme and produces the pigment stercobilin, which is responsible for the brown color of feces. Bilirubin = Billy Rubin.
It's funny, see? It's a pun! Laugh at my shit joke! LAUGH, I SAY!
It's funny, see? It's a pun! Laugh at my shit joke! LAUGH, I SAY!
Strange, isn't it? Each man's life touches so many other lives. When he isn't around he leaves an awful hole, doesn't he?