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In-N-Out's secret menu is actually available online, but that doesn't make ordering a 4x4 any less fun.
Let's start with the least secret of all our secret menu locales: In-N-Out Burger. This fast food franchise, hugely popular throughout the southwestern United States, has a number of offerings you won't find on their in-store menu. Their unpublicized options include a grilled cheese sandwich, "Protein Style" (no bun) and "Animal Style." This last item can be applied to any sandwich, resulting in a mustard-cooked beef patty, extra spread, lettuce, tomato, pickle and grilled onions. Rumor has it that you can also get Animal Style fries, which involves cheese, spread, grilled onions and pickles. Better get a fork, just in case!