Tehelka!!!
Here's what you do: You fill up the slots meant for Iced Tea in select vending machines with Diet Cherry Coke. So whenever somebody wants to get 1 can of ice tea, he gets 1 can of Diet Cherry Coke instead, right?
Wrong. You are the kind of schemer who makes Karl Rove look like Isiah Thomas[1]. You don't make the switch at any old vending machine. You do it at vending machines at select universities, usually near the bookstores. You know that men of learning, some of whom are enrolled in advanced programs in science and technology, use these vending machines.
You know that a man of learning, on getting a Diet Cherry Coke instead of an Iced tea, does not just curse the vending machine and walk away. A man of learning does not make assumptions about the behavior of a system with just one sample. A man of learning tries to get another Iced Tea, and verifies that the problem is indeed repeatable. He also considers getting a third sample, to check the system for non-linearities, but rejects it the idea as going too far.
But that's not all, is it? A man of learning, having resolved beyond reasonable doubt that asking the vending machine for an Iced Tea results in his getting a Diet Cherry Coke, wonders if the relation is symmetric. He wonders if asking for a Diet Cherry Coke will get him an Iced Tea. He tries it and discovers to his utter dismay that the relation is asymmetric and that asking for a Diet Cherry Coke gets him a Diet Cherry Coke.
Defeated, the man of learning walks away with 3 Diet Cherry cokes.
[1] Indianized version: John Buchanan look like Kapil Dev

