I've long since fallen in step with the idea (catechism?) that catsup on hotdogs is verboten, though in my ignorant youth, despite growing up near the high church of hotdogs, Chicago, I'd put catsup on there with everything else on the condiment shelf, from chili to horseradish.
Now I go with the local hot dog stand's prescriptive meat chili, onions, and mustard, and I'd take relish if it was offered.
As a U.S. sailor on liberty in uniform in Hong Kong, I found out that anything you ordered at a restaurant or diner, the wait person would pro forma plant a bottle of catsup in front of you ... even if you were just having a cup of coffee. Yankees wanted catsup, no matter what. Don't ask. That was back in the days when Hong Kong was a British Crown Colony. The school kids all wore blue blazers and neckties.
I saw the best and biggest parade of my life when I, totally uninformed, took the boat to Kowloon and encountered a Chinese New Year parade that went on for hours attended by about sixty thousand people.