The Grilled Cheese Principle

I came upon this theory one day in 2008 while visiting my mother, and father, who was still alive at that time.  But, he doesn't figure in this posit, so I don't associate him with it.  My mother, on the other hand, unwittingly is the source of it.  She asked me if I wanted a grilled cheese sandwich.  I am not overly fond of grilled cheese sandwiches, and I almost never make them for myself, but I told her that yes, I would like her to make me a grilled cheese sandwich.
It was delicious, and completely unremarkable.  Made with plain white Italian bread and individually wrapped Kraft American cheese slices, served with a pickle on the side, it was not an overly fancy gourmet dish, just a regular grilled cheese, and I thoroughly enjoyed it.  That's when it occurred to me:  A grilled cheese sandwich made by somebody else tastes inherently better than one that I make for myself.  Thus was born the theory of The Grilled Cheese Principle, which is applied to any food being tastier when prepared by someone other than you.