Every work week from 1978 through 1998, my informant had pepperoni pizza on Friday nights. It changed pizzerias as the informant moved (Melo’s in Pleasant Hill, and then the main pizza place on Bainbridge Island), but the custom remained the same. The informant stopped when he moved to Hong Kong because he couldn’t find decent pepperoni pizza there, and then shifted the practice to the weekends when he returned to the United States.
This pizza was a celebratory event, a treat at the end of a work week no matter how stressful or easy that week was. It’s subconsciously carried on in his family, as Friday night is the most likely night on which they order pizza for celebrating the end of the week, relaxing afterwards and preparing for the week ahead. It’s an adaptable tradition, as it changed over time when other factors in his life changed.