A sandwich is meant to be eaten by hand. Like so -

http://fullmetalpatriotblog.com/wp-content/uploads/2011/08/obama-eating-...

I have no idea why my Chinese friend freaks out when she sees me pick up a sandwich or burger with my bare hands, and not wrapped in a paper napkin.

You don't need flatware for pizza or wings, or ribs, or KFC.............