Biscuit cutters
Auntie Mona had the biggest tub of biscuit cutters you've ever seen, and somehow she knew exactly what was in there. One of us would name a shape, she would reach in, and there it was. A mushroom, a Pikachu, a battery, Australia. We thought: there's no way they all fit in there. She must be magic. So when Mum and Dad went away for the weekend and we stayed over, I crept down in the night and had a look. I tipped them out onto the floor, and I was right: there was no way to fit them back in.