Case. Partners from different cultures argue over holidays, food, the role of relatives — “that’s not how we do it”.
Model. Unaligned defaults from two firmwares. Trivial apart, together a background conflict.
Protocol. Don’t pick “whose culture is right”; assemble the couple’s shared traditions, taking the best of both.
Lesson. Differences are an expanded set of options, if not turned into a fight over who’s right.