Now thats what I call a dialogue:

My favourite dialogues from my favourite movie of all time:

Star Wars: The scene: Luke Skywalker has just failed in his attempt to pull out his space fighter which has sunk beneath the swamp on the Dagobah System-Yodas Home.

Luke Skywalker: We'll never get it out now!
Yoda: So certain are you. Always with you it cannot be done. Hear you nothing that I say?
Luke Skywalker: Master, moving stones around is one thing. This is totally different.
Yoda: No! No different! Only different in your mind. You must unlearn what you have learned.
Luke Skywalker: Alright, I'll give it a try.
Yoda: No! Try not! Do, or do not. There is no try.
[Luke concentrates, and the X-wing begins to rise out of the swamp. A moment later, however, it sinks the rest of the way, with Yoda and R2-D2 both expressing their disappointment.]
Luke Skywalker: [tired] I can't. It's too big.
Yoda: Size matters not. Look at me. Judge me by my size, do you, hmm? And well you should not, for my ally is the Force. And a powerful ally it is. Life creates it. Makes it grow. Its energy surrounds us, and binds us. Luminous beings are we, not this crude matter. You must feel the Force around you. Everywhere. Here, between you, me, the tree, the rock, everywhere. Yes, even between the land and the ship.