He actually hates that joke, but I still get a kick out of it.
Like most places you travel, if you look around at the people on the plane you can always tell (or at least guess) where they are coming from or where they live. For example, if you are en route from Arizona to New York, and you see someone wearing a dreamcatcher necklace, chances are you've got a Zoni on your hands.
Or if you are going to Hawaii and someone is decked out in sunglasses and a hat and a fake lei, well then, you know they are not the native Hawaiian.
So today, I fully expect to see lots of these types of shirts:
as well as these:
and I bet we could guess who is the Idahoan and who isn't.