This got a little more confusing than it had to (largely because we included Cadbury Eggs in the test), but if you’re trying to determine whether what you’ve got on your hands is a raw egg or a hard-boiled egg, here’s what you do:
Step 1: Spin the egg. A hard-boiled one will spin neatly; a raw one will go all wobbly.
Step 2: Lightly touch the spinning egg with a finger. A hard-boiled one will come to a full stop, while a raw one will continue on its wobbly way.