My favourite lines all come from "Deal Me Out"...
Captain Pak: "Did I make the straight? 2, 3, 4, 5......9!" What made it better was the dead-pan expression on Pak's face.
Hawkeye: "Nobody move!"
Hawkeye: "One of the sandwiches just moved!"
Radar: "We have whiskey, vodka, gin...and for your convenience, all in the one bottle!"
This has been mentioned before, but it's still good...
Halloran: "Up close, you're a man!"
Klinger: "Far away, too!"
Talk about all things M*A*S*H -- the novel, the film, the television series, even the play. Not to mention the spin-offs, merchandise, cast, crew and anything else you can think of to talk about.