We had a restaurant called Gurneyburgers. Not sure if I have the spelling accurate as they went out of business so long ago it's hard to remember. I always enjoyed their burgers the most which I might consider the best in fast food. The shredded lettuce with tomatoes and onion where great but the mayonnaise they used was really what made it my favorite. Sonic and Primo restaurants today use similar if not the mayonnaise which reminds me of it, but more than just that first taste is the memories that usually accompany it if you where happy in the moment a special tasting memory is forever in bedded in your mind to compare all others too. It's like that with many other "first" sensations and experiences. So create many happy first moments as they will be your comparison ones for future reference.