I love their shakes and animal style fries. But the best thing about In-N-Out has to be the custom number of patties you can order on your burger--say you're in the mood for a 100x100 burger one day. It's possible at In-N-Out: http://www.supersizedmeals.com/food/article.php/20060125050438458

Here is also the secret menu that is not so secret seeing as i found it online.

"3-by-3" = three meat patties and three slices of cheese.

"4-by-4" = four meat patties and four slices of cheese.

"2-by-4" = two meat patties and four slices of cheese.

*Note: You can get a burger with as many meat patties or cheese slices as you want. Just tell the In-N-Out Burger cashier how many meat patties and how much cheese you want and that is what you'll get! For instance, if you want 6 pieces of meat and 10 pieces of cheese tell them you want a "6-by-10."

"Double Meat" = like a Double Double without cheese.

"3 by Meat" = three meat patties and no cheese.

"Animal Style" = the meat is cooked and fried with mustard and then pickles are added, extra spread and grilled onions are added.

"Animal Style Fries" = fries with cheese, spread, grilled onions and pickles (if you ask for them).

"Protein Style" = for all you low-carbohydrate dieters, this is a burger with no bun (wrapped in lettuce).

"Flying Dutchman" = two meat patties, two slices of melted cheese and nothing else - not even a bun!

Fries "Well-Done" = extra crispy fries . . . even better than the regular!

Fries "Light" = opposite of fries well-done, more raw than most people like 'em

"Grilled Cheese" = no meat, just melted cheese, tomato, lettuce and spread on a bun.

"Veggie Burger" = burger without the patty or cheese. Sometimes we call this the "Wish Burger."

"Neapolitan" Shake = strawberry, vanilla and chocolate blended together.

The friendly employees of In-N-Out Burger will take your special order without question, if you use the right terminology. The printed receipt will have your special request typed on it just as we said it.

Try it!