The 14 Wildest Fast-Food Secret Menu Items (Slideshow)

When you order a sandwich at Subway, the first thing they do is slice the bread. Before they do that, though, ask for it "old style." They'll dig a trench out of the bread instead of just slicing it, making extra room for more cold cuts. 

Five Guys doesn't sell veggie burgers and hot dogs in the traditional sense, but if you ask, they'll fill a bun with every single topping they have, including nine different vegetables. 

Want extra cheese? Bacon? Burger patties? Just ask. They'll do it. Even to the extreme. 

Want your Doublicious sandwich topped with a schmear of mashed potatoes and a ladle of gravy? How about bacon on those Chicken Littles? You got it. 

Ask for a burger Rodeo-style here, and you just might find yourself walking out with a burger topped with onion rings and barbecue sauce. 

It's messy, but they'll make this discontinued menu item for you if you ask nicely. And chili beats beans any day.

This is technically a regional offering, so you might find it on an actual menu here and there, but if you don't, just ask for it. They have the ingredients back there. 

If you want a chicken and waffle sandwich from McDonald's during the breakfast hours, just ask for one and they might make it for you. If they won't, buy a sausage McGriddle and a Southern Style Chicken Biscuit, put the chicken in between the McGriddles, and boom: chicken and waffles, or something close to it if you want to nitpick. And hey, you're left with a sausage biscuit!

These were once featured on Sonic menus, but have been discontinued. But they've got pickles and batter back there, so try asking nicely. 

If adding peanut butter to your bacon burger is your thing (we hear it's pretty tasty), the friendly folks at Shake Shack will be more than happy to add a smear to yours. 

In-N-Out advertises its own "Not-So-Secret Menu,"  which is home to what is arguably its most legendary creation: the Animal-Style burger. A patty cooked with mustard is topped with lettuce, tomato, special sauce, pickles, and grilled onions, and it's delicious. But what about Animal-Style fries? An order of fries topped with cheese, secret sauce, pickles, and grilled onions? Otherworldly. 

You might not want to order this too loudly, but if you ask for it they'll most likely be able to make it for you. So what is it? A double cheeseburger with a chicken sandwich, bun and all, stuck between the patties. Good luck!

Wendy's actually has a fairly comprehensive secret menu, complete with named items like the Grand Slam, which is four patties in one burger (also affectionately called the "Meat Cube"). Our favorite? The Barnyard: a burger patty, a spicy chicken fillet, ham, and bacon, with a slice of cheese in between each. Carnivorous perfection. 

This tops our list for several reasons: One, you'll sound awesome ordering it. Two, it's actually a double secret menu item, because it includes two off-menu items. Three, it's freakin' delicious. It's created by making a traditional quesadilla (a giant tortilla gets filled with cheese then pressed), but after it's been pressed they'll open it up and load it with all the fillings you want. Finally, it's rolled up into the shape of a (giant) burrito. It's nothing short secret menu perfection.