Quote from Cliff in Rich Man, Wood Man
Cliff: Boy, oh, boy. Woody and Kelly split up, huh? Frasier: Yes, well, I guess having access to all her money made him feel a little like a leech. Cliff: You, uh, seem to make the word "leech" sound, uh, pejorative, there, Fras. An educated man would be proud to be called a leech. Leeches are a boon to mankind. Frasier: I take it you're referring to the practice of using leeches as a medical cure-all, a practice which has been discredited for centuries now. Cliff: Discredited or covered up? Frasier: Well, you've got me there. Cliff: Sure, your big drug companies don't want you to find out about leeches. You know why? Leeches are free. Yes, sir. I- I have great respect for the leech. Frasier: I'm sure the feeling's mutual.