The probability of a couple irritably yelling at each other during packing for a move increases in proportion to the percent of floor space covered in unstacked box-in-progress chaos.
I used to be way better at the crap-to-tetris phase of the game.
It is mediated by proportion of floor space occupied by my/your stuff (not easy to classify sometimes--"this is OUR stuff, not mine!")
All this is exacerbated by clash of MBTI types (J/P and T/F).