My son got a glowstick from a birthday party he went to over the weekend. He'd never seen one, so I showed him how it worked. My wife cracked the inner chamber, and as it began to glow, I herded him into the bathroom--the only dark place in the house.
It was a shining green by that point, and it reminded me of the crystal in Superman's rocket from the first Superman movie.
"Check it out, Brody. Just like in 'Superman.'"
He looked at it for a second, then took it from me. He began swinging it around.
He then said he wanted a green lightsaber. It was one of those proud dork dad moments.