Is This a Sandwich? (medium.com)

This is the sort of thing that lawyers love to argue over.

E.g. is a tomato a fruit or a vegetable? Think you know the answer? The US Supreme Court might disagree with you: https://en.wikipedia.org/wiki/Nix_v._Hedden

And this is a podcast episode (from Sporkful) on the same problem: http://www.sporkful.com/what-makes-a-sandwich-a-sandwich/