Matte black space pen
Three reasons: -It's used by astronauts -It writes at -20 degrees F to 250 degrees F, underwater, at any angle, even upside down -It was in a Seinfeld episode
Clothes, toys, art and film that use the image of the classic astronaut. All for sale and links to all of them in the post.
I don't have a son, but if I did, this would be the light fixure I'd put in his room (whether he liked space or not, lol). Awesome design looks like a satellite and has little astronauts dangling from it.