Fast Food Trivia: 10 Juicy Facts About Your Favorite Chain Burgers

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6. In-N-Out's Animal-Style Burger Was Created By Customers

Legend has it that a famous (not so) secret menu item, the Animal-Style burger from In-N-Out, came into popularity by word-of-mouth, after a customer spotted a cook making an off-menu burger. The employees apparently referred to loitering teenagers as "Animals," and when they came to order the special burger, they were told to ask for an "Animal burger." From then on, the burger, which is fried in mustard and topped with pickles, grilled onions and extra spread, became a smashing success by word of mouth. Today, it's served with lettuce and tomato and the burger of your choice.