Here's a conundrum if anyone wants to play detective.
Husband, wife, and two teenage children keep some of their shoes in a cupboard by the front door. Other shoes are kept in the bottom of each person's wardrobe.
One day, DD opens the cupboard to put on her shoes for school but they're not there. They're not in her wardrobe either. They have somehow vanished. She had worn them at some point during the previous week and is convinced she left them in the cupboard. But she hadn't been attending school every day because she was sitting exams and the school had given its students time off to study. Mum searches everywhere in the house, including emptying everything out of the bottom of each wardrobe, and they're nowhere.
A few weeks later, DD discovers them in the bottom of her wardrobe, thrown in by the looks of it.
No pets in the house.
What would be your first thought?