My minor annoyance: We went to my parents' house, they live about an hour away. Dinner was to be served at 1:00. We arrived at 1:02, timing it close but not exactly, to discover the prayer had been said and folks had already gone through the line...starting around 12:45, because everything had been ready, so why hold off?
My parents hadn't yet gotten their food, they waited until we got ours.
A very minor annoyance, as there was plenty of food and it was nice to not wait in a line to serve ourselves at the buffet. My BIL and his two kids got there at the same time we did, then he went home to be with the sick third child and his wife (my sister) came late, for pie. I didn't resent the early start at all, but I was put in mind of all the stories I've read of people holding up dinner for another guest or a few guests; my family is opposite, apparently; they serve the people who are there early.