Soon after DS was potty trained, DW noticed that he was always running short of underwear. She would swear up and down that she had just done laundry and that he should have plenty of clean undies. There was also an issue of my son's room having a particularly locker roomie odor. Sue did not put one and one together. She went out and bought DS a dozen more pair of undies.
Several days later, she decided to track down the source of the smell. She found nearly a dozen pair of soiled underwear stuffed under his desk. Seems he was to asshamed to admit that he had had an accident and simply hid the evidence. So two mysteries were solved at once. And for a while, DS had nearly a month's supply of underwear. And his room smelled a whole lot better.