Raw or Hard Boiled?

I read this and find the concept interesting. Now I need to hard boil some eggs so I can play with my eggs! I thought I'd get it posted with hopes you still have some Easter eggs left if you want to give it a try too!

How do you tell if an egg is hard boiled or raw?

Spin them.

Supposedly, if they are hard boiled they will spin "cleanly".
If they're raw the yolk will supposedly throw the spin "off-kilter".