But it doesn't matter. That's why I said 2 and 6 and not 2 and 5. If 2 and 5, the friend I owe the extra token to matters. If 2 and 6, even after I have honored my debt there are still enough tokens left to buy the toy.
(Or… are they human after all?)
Sometimes you can indeed trick some people with an obfuscated reasoning that has a cleverly hidden division by zero, but when they arrive at the conclusion that x < x, or x != x, they stop and accept that they got it wrong somewhere somehow. They don't insist that they're right and that the statement is perfectly reasonable and logical.