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Viewing Single Post From: Prove you're not a zombie
MrGuy

Sorry for the self-reply - separating my proof from the problem statement.

I have a picture on my cell phone of me purchasing pizza. This is proof positive that I'm not a zombie.

Facts:
A.) While it may not be the only thing they eat, zombies are known to have a strong fondness for brains.
B.) Pizza places are in business to make money
C.) No pizza place offers brains as a pizza topping.
D.) I have proof that I purchase pizza.

Proof:
Assume the following premise: "Zombies do purchase pizza."
1.) By premise and A, if zombies were capable of ordering pizza, when asked what toppings they wanted, at least some of the time the zombies would have requested "Brains."
2.) By 1 and B, if there were customer demand for pizza with brains, at least some pizza places would have decided to serve this market demand by offering pizza with brains.
3.) 2 and C are a logical contradiction - if the premise were true, there would exist pizza places that offer brains as a topping. But this is not observed.
4.) Therefore, the premise must be false, and therefore we know zombies do NOT purchase pizza.
5.) By 4 and D, it must be the case that I am not a zombie.
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