My friend and I were at Subway getting sandwiches one day and noticed the BMT on the menu, which consists of ham, salami, pepperoni, bologna, and veggies. It's certainly a sandwich I would never eat (it's way too exciting; I go for turkey every time) but we were curious about the name. There were no ingredients that would provide the sandwich with the initials BMT. So we asked the sandwich maker and he said if we guessed it, he'd give us a free sandwich. We tried bacon, mayo, tomato (wrong); bread, mustard, tomato (wrong); bologna, meat, toasted (wrong), big monkey turd (clearly wrong), etc.
The sandwich guy told us it actually stands for Brooklyn-Manhattan Transit, which I guess makes sense for a sandwich chain named Subway...?
So, remember the BMT. You might get a free sandwich someday.