Had never heard of the Princess Brides battle of wits
Mike Green @profplum99 mentions it is the basis for his twitter avatar and a reminder to ensure he's playing the game he thinks he is playing
Didn't really follow so looked up the dialogue
It's so good....
Vizzini: For the princess?
To the death?
I accept.
Man in Black: Good.
Then pour the wine.
[Vizzini pours the wine, and the Man in Black pulls out a small vial]
All right. Where is the poison? The battle of wits has begun. It ends when you decide and we both drink, and find out who is right... and who is dead.
All I have to do is divine from what I know of you: are you the sort of man who would put the poison into his own goblet or his enemy's?
Now, a clever man would put the poison into his own goblet, because he would know that only a great fool would
I am not a great fool, so I can clearly not choose the wine in front of you.
But you must have known I was not a great fool. You would have counted on it, so I can clearly not choose the wine in front of me.
Vizzini: Not remotely! Because iocane comes from Australia, as everyone knows! And Australia is entirely peopled with criminals. And criminals are used to having people not trust them, as you are not trusted by me, so I can clearly
Man in Black: Truly, you have a dizzying intellect.
Vizzini: Wait till I get going! Now, where was I?
Man in Black: Australia.
Vizzini: Yes, Australia. And you must have suspected I would have known the powder's origin,
Man in Black: You're trying to trick me into giving away something. It won't work.
Vizzini: It has worked! You've given everything away! I know where the poison is!
Man in Black: Then make your choice.
[Vizzini points at a rock behind the Man in Black]
Man in Black: Where?
[When he turns to look, Vizzini swaps the goblets]
I don't see anything.
Vizzini: Well, I- I could have sworn I saw something. No matter.
Vizzini: I--I'll tell you in a minute. First, let's drink. Me from my glass, and you from yours.
[They drink from their goblets]
Man in Black: [smirks] You guessed wrong.
That's what's so funny! I switched glasses when your back was turned! Ha ha, you fool!
You fell victim to one of the classic blunders!
The most famous of which is "never get involved in a land war in Asia," but only slightly less
[He laughs hysterically, but suddenly freezes mid-laugh and dies; the Man in Black removes Buttercup's blindfold]
Buttercup: Who are you?
Man in Black: I am no one to be trifled with.
Buttercup: And to think, all that time it was your cup that was poisoned.
Man in Black: They were both poisoned. I spent the last few years building up an immunity to iocane powder.