Over in the US, In-N-Out has an infamous 'secret menu'. Except it's not exactly secret because everyone pretty much knows about it. But for those who don't know, Foodbeast did brave work in cataloging In-N-Out's secret menu.
You'll see Animal style burgers (mustard grilled patty, grilled onions, extra spread and pickels), Animal style fries (cheese, grilled onions, spread), Monkey style burgers (fries in your burger!), and so much more.