KFC was confused about the Triple Down (three chicken filets instead of two), another rumored item on its secret menu, but when I asked for them to put one Double Down on another, they said sure. It took about 10 minutes for them to make. It's called a Quadruple Down, and it was worth the wait.
Burger King’s workers were similarly obliging in combining menu items to make my order. The cashier had never heard of Frings (half fries, half onion rings) or a Quad Stacker (four beef patties, four slices of cheese, bacon), but he was happy to accommodate my request. Hooray!
So, yes, I did get to enjoy some of the rumored secret items. But if you went to McDonald’s, ordered a Big Mac, and then had to tell the worker how to combine two cheeseburgers and add special sauce and lettuce, would you still say a Big Mac was part of the menu? You wouldn’t. So the combination of four BK bacon cheeseburgers, plain, is not part of a BK secret menu.