If there's anything cooler than laser beams, I haven't seen them. You can buy better hardware than Captain Kirk had from Amazon.com these days. You'll have to get your own green space babes, but Cool Tools has a roundup on the available models of green colored laser beams pointers for sale, cheap, right now. Why green?
Endlessly useful for folks trying to point things out, like astronomers, lecturers, birdwatchers, arborists, police and firemen, building inspectors, and just plain fooling around. Useful for pointing out things without touching them also, if you're in a "no electrostatic discharge" walk of life.
Do we even have to remind you not to point them at airplanes?