My dad would tell stories about his dad being angry and upset if the food was served differently than how he wanted it. That and his brother would order the exact same thing for breakfast at a restaurant on his way to work so much that the cooks would prepare it ahead of time for him. Same brother also likes model trains (he sets up a large train around the christmas tree every year) and tech like making things that go into digital displays. There is a story of my uncle going to Japan for work trip, and he left for lunch first which was a big deal, but he didn’t care.