Yes, I have this page bookmarked. 
24 Secret Restaurant Menus Revealed - Secret Menus and Hidden Menus for Restaurants
24 Secret Restaurant Menus Revealed - Secret Menus and Hidden Menus for Restaurants
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Yep, a long time ago. Used to like their tacos when I was a kid.
14 in one sitting is my personal record....
I order that every time I go to DQ. I didn't know it wasn't on the menu. They never blink when I order it, though.
Another one at Subway, the Chicken Pizziola. It's a chicken sub, with pepperoni and marinara sauce. Get it with provolone and lots of Parmesan cheese. It was on the menu for about a month, then disappeared.
At Arbys, the Ultimate BLT isn't on the menu any longer, either, but I get that more than any other sandwich on the menu.
At McDonald's, one that never was on the menu, but I order it all the time, is a Double Sausage McMuffin. It's a creation of my own from back when I was a manager at Mickey D's. It's like a double cheeseburger, only not. You might have to walk the cashier through ordering it, but the kitchen will always make it correctly. A Sausage McMuffin (or Sausage Muffin) is just a muffin, sausage patty, and a slice of cheese. Tell them you want a Sausage McMuffin (no egg, dammit) with an extra patty and an extra slice of cheese. If it's during the day when I know they have everything for burgers all set up, I'll also have them put a couple of pickles and a shot of mustard on it. Either way, it's cheesy, sausagey goodness. Sometimes I order two.