A taco is a sandwich A hot dog is a sandwich A burger is a sandwich

There is such a thing as an open-faced sandwich, which has one slice of bread.

If I crumble an assembled taco, I get nachos.

If I crumble an assembled hot dog, I do not get nachos.

If the two were equivalent, performing the same action on each should produce similar results.

I suppose you could say that hot dogs, subs, hoagies, etc are kinds of tacos, but I can't see what element of the taco should give it this priviledge. It would seem, rather, that tacos, hot dogs, and sandwiches are all examples of the ursandwich where some (hot dogs et al) are members of the triwich family (being surrounded on three sides or containing a single continous substrate on three sides) and that some (burgers et al) are members of the duwich family.

This allows us insight into the great pizza debate. To the uninitiated, the thin crust and deep dish appear similar. We can see, however, that they are merely related cousins on seperate sides of the urwich family. One is a rare example of the unwich having bread on one side, while the other is a duwich. This easily explains the preferential division in humans. Some see no familial distinction while others care deeply as to which derivation of the urwich they are eating.

edit: on an entirely unrelated note, I will die on the 'cereal and oatmeal are soups' hill