Dr. John A. Zoidberg is a lobster-esque alien from planet Decapod 10 and the Planet Express physician.  Zoidberg seems generally clueless about human anatomy and is kind of a homeless loser.  We love him anyway.

Dr. Zoidberg is voiced by Billy West.

Dr. Zoidberg Quotes

Zoidberg: Now open your mouth and let's have a look at that brain. No, no, no, no, no, not that mouth!
Fry: I only have one.
Zoidberg: Really?

Fry: Uh, is there a human doctor around?
Zoidberg: Young lady, I'm an expert on humans.

Futurama Quotes

It's just like the story of the grasshopper and the octopus. All year long the grasshopper kept burying acorns for winter while the octopus mooched off his girlfriend and watched TV. Then the winter came, and the grasshopper died, and the octopus ate all his acorns and also he got a racecar. Is any of this getting through to you?

Fry

Farnsworth: (on the phone) Oh, how awful. Did he at least die painlessly? To shreds, you say. Well, how is his wife holding up? To shreds, you say. Very well then. (hangs up) Sad, sad, terrible, gruesome news about my colleague, Dr. Mobutu.
Leela: Was his apartment rent-controlled?