There is an entertaining writeup on howstuffworks.com about the inner workings of a lightsaber. The marketing around Star Wars 3 is so bad that even people with feeding tubes should know that the new movie is coming out soon. As if the Evil Emperor M&M’s didn’t spell it out enough for you.
“Important Safety Information
A lightsaber is not a toy! Keep it out of reach of children at all times. Lightsaber locks are required in most states.”