IN-n-OUT burger is the shit!!! I had it when I flew out to Cali to meet up with a friend in the Marines. He's like, "Dude, you gotta have some IN-n-OUT burger." I had the same reaction as your friend. That shit's gotta be like a west coast whitey's. I was wrong. Great little place to eat.
IIRC, they only had like three meals to order: Hamburber, cheeseburger, or double cheeseburger.