Thanks to this man I always multiply estimates by a factor of four. Star Trek III: The Search for Spock
Kirk: How long to re-fit?
Scotty: Eight weeks. But you don't have eight weeks, so I'll do it for you in two.
Kirk: Do you always multiply your repair estimates by a factor of four?
Scotty: How else to maintain my reputation as a miracle worker?
Kirk: Your reputation is safe with me.
Still my favorite Scotty quote is Scotty explaining how he got rid of the tribbles in Star Trek Episode 42, The Trouble with Tribbles, "Just before they went into warp, I beamed the whole kit and kaboodle into their engine room, where they'll be no tribble at all."
Good Night Mr. Doohan. Your reputation is safe with me too.