I may have this backwards, but a good hard-boiled test is to "spin" the egg on the countertop. <corrected-thanks Mwilding> Raw eggs wobble and hard boiled eggs spin. Also, if you hold an egg up to a bright light, you can tell how well done it is. If it glows bright orange then it is raw, very faint light is softboiled, and no light is boiled. You can use this as a test when you are done boiling your eggs.
Oh, and if you want to have some real fun get some friends together after drinking and try cooking a whole egg in the microwave. My roommate literally blew the door off the microwave at a party we had one time.