For me, it's the Flying Dutchman Animal Style. The best fast food sandwich. I even ask for extra chopped chilis and the staff is so friendly and more than willing to oblige.

One time I asked for an extra slice of cheese and they gave me three. I said, "Wow, three for free!" and the nice friendly In-N-Out worker laughed and said, "I'm going to call you 3-for-free!".

Now the staff greets me with "hey it's 3-for-free!" and ALWAYS give me three slices. It's such a fun and cool atmosphere at my local In-N-Out restaurant, I go there at least 3 times a week for lunch and a large milkshake, 1-2 times for breakfast on the weekend, and maybe once for dinner when I'm in a rush but want a great meal that is affordable, fast, and can match my daily nutritional needs.

I even dip my fries in milkshake, it's delicious! What a great restaurant.