I have fond memories of In-N-Out. In fact, one is fairly near my house, so I don't need to go deep into my past: I can simply go over there and get one whenever the mood strikes me. I recognize that the burgers themselves aren't (to the truth be told) particularly all that good. I suspect that my fondness for them stems from a memory of the first time I had one, when the In-N-Out in Pinole had just opened, I was in the process of hunting for my first house. Carmen and I stopped in, and had a couple of them, and whether it was the stress of the day or whatever, I thought they were the best thing on earth.
Some others seem to have similar notions. This article was interesting, because a fanatic went to the trouble of dissecting their burgers and making them at home. That he used mathematics and their nutritional information as clues is just a bonus. Check it out: