( Mental Floss ) -- Your mission , if you choose to accept it , is to seek out covert items at fast food chains around the country . Not all food items are always listed on restaurant menus . Be warned , this mission includes very real dangers such as hardening arteries and skyrocketing cholesterol . We 've compiled a list to get you started . 1 . If you 're at Starbucks and in need of just a little caffeine , do n't worry -- there 's a tiny option for you . It 's the Short size , and they do n't advertise it . It 's like a little baby cup of coffee . It also comes in handy when you 're scrounging for change and do n't have enough for a tall ( not that that has ever happened to me ) . 2 . It 's a good thing we do n't have Jamba Juice here in Iowa , because I would be all over candy-based smoothies . Because it 's considered a health-food chain , Jamba Juice does n't officially list these on their in-store menus , but the Web site Mighty Foods assures us that the secret flavors exist . The ones they confirmed with the company 's headquarters include Strawberry Shortcake , White Gummy Bear , PB & J , Various flavors of Starbursts , Fruity Pebbles , Push-Up Pops , and Skittles . Other tantalizing flavors that are rumored to exist : Chocolate Gummi Bear , Apple Pie , Sourpatch Kid , Tootsie Roll , and Now and Later . 3 . This one might be my favorite . At Fatburger , you can order a Hypocrite -- a veggie burger topped with crispy strips of bacon . 4 . Chipotle has a whole secret menu that is limited only by your imagination -- they have a store policy that says that if they have the item available , they will make it for you . Things that have been tested include nachos , quesadillas , taco salads and single tacos . Some stores are testing out quesadillas as a regular menu item , however , so maybe someday soon you wo n't need a super-secret handshake to order one . Mental Floss : 7 food promotions gone horribly wrong . 5 . If you 're at Wendy 's and you 're really hungry -- like , three-patties-just-won't-cut-it hungry -- go ahead and order the Grand Slam , which is four patties stacked on a bun . This option is only available at select Wendy 's , and it 's also known as the Meat Cube . 6 . Several places , including McDonald 's and In-N-Out , will serve you the Neapolitan milkshake . It 's just what it sounds like -- chocolate , vanilla and strawberry shakes layered in a cup . 7 . In-N-Out Burger 's `` secret menu '' is n't so secret these days -- in fact , they 've posted it on their Web site . But in case you 're not in the habit of surfing fast food Web sites , here 's the skinny on their rather un-skinny items : ordering something `` Animal Style '' at In-N-Out means you 're going to get it with lettuce , tomato , a mustard-cooked beef patty , pickles , extra spread ( it 's sort of Thousand-Islandy ) and grilled onions . You can even get your fries Animal Style . Mental Floss : Why is it called `` Thousand Island '' dressing ? `` Protein Style '' is a burger wrapped in a lettuce leaf instead of a bun . A Grilled Cheese is two slices of American cheese , lettuce , tomato and spread on a bun ( grilled onions if you so choose ) . And you can get just about any combo of meat and cheese that you want if you order it like you 're ordering lumber : 3×3 gets you three beef patties and three slices of cheese , 4×4 gets you four of each , and so on . According to photos posted at SuperSizedMeals.com , one gluttonous patron requested and received a 100x100 at a Las Vegas store a few years ago . One item not listed on the Web site secret menu : the Flying Dutchman , which is two slices of cheese sandwiched between two patties , hold the bun . 8 . Feeling a little health-conscious at Popeye 's ? If you are , you really should have gone somewhere else . But there 's a little hope for you -- ordering `` naked chicken '' will get you breading-free poultry . The word is that this is on the menu at some Popeye 's , but not all of them , although it is an option at all of them . 9 . Like Chipotle , Taco Bell will make you just about anything within reason as long as they have the ingredients for it . Since most of the food at Taco Bell is made out of the same basic items , that means you can probably ask for most discontinued items and get them . One `` secret , '' though , is that they have a not-advertised green chili sauce at most locations , and apparently it 's excellent . 10 . Some Subways will still make you the popular pizza sub from the 1990s . Once the chain decided to make their focus healthy eating , the pizza sub disappeared from the menu in most places ( the word is that Canadian and Mexican Subways still offer them on a regular basis ) . But if you ask , lots of places will still make it for you . Be warned , though -- Jared would not approve of the nine slices of pepperoni and copious amounts of cheese slathered in marinara sauce . Mental Floss : Brief history of dubious dieting . For more mental_floss articles , visit mentalfloss.com . Entire contents of this article copyright , Mental Floss LLC . All rights reserved .
Some fast food outlets have not-on-menu items you can get if you ask for them . Fatburger 's Hypocrite is bacon-topped veggie burger ; Popeye 's offers naked chicken . Some Subways will still make the popular pizza sub from the 1990s . Wendy 's offers the Meat Cube ; McDonald 's has a Neapolitan milkshake .