Here's a paradoxical birthday cake puzzle for you: If the cake has 5 layers, but each layer has a different flavor, and you have to choose one layer that you haven't tried before, but the person who baked the cake has never tried any of the flavors before either, and they're standing on the other side of the room, and you're in a room that's 5 times larger than the room they're in, and you have to close the door to talk to them, and they have to close the door to talk to you, but you both have to talk to each other, and the cake is on the table in between, and the table has a hole in it... Quantum Cake Theory to the rescue!

Solution in a Box
Quantum Mind Bender