I know, I know!
We had friends round for the day this weekend and lunch was a "make your own sandwich" type affair, all bits out, put what you want in it. There was cheese, ham, tuna, salady bits, pickles and sauces etc.
Now my friend Bob* had ham AND cheese in his sandwich
To me, that seemed like he was having two fillings in one sandwich - terribly indulgent 
*Name changed to protect sandwich eater's identity ;)