Fry: Where did Cubert come from?
Farnsworth: 12 years ago I began the cloning process by removing some skin cells from one of the shapelier growths on my back.
Leela: Wait. If he's your clone, why doesn't his nose look like yours?
Farnsworth: I left him in his first tube too long and he got squished up against the side.
Bender: Is he dumb or just ugly?