The Princess Bride:
Man in Black: Inhale this, but do not touch.
Vizzini: [sniffs] I smell nothing.
Man in Black: What you do not smell is called iocane powder. It is odorless, tasteless, dissolves instantly in liquid, and is among the more deadlier poisons known to man.
[He puts the goblets behind his back and puts the poison into one of the goblets, then sets them down in front of him]
Man in Black: 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.
[Vizzini stalls, then eventually chooses the glass in front of the man in black. They both drink, and Vizzini dies.]
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.
...Man in Black: All right. Where is the poison? The battle of wits has begun.
Vizzini: But it's so simple. 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 reach for what he was given. 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 choo
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