As you may know, today is Star Wars Day. (As in, "May The Fourth Be With You." Get it?)
The Laser Saber mimics how lightsabers switched on and off in the Star Wars movies, with the beam creeping up the side of a plastic tube. Oh yeah, there's a real (and dangerous) laser packed in there too.
The whole setup will cost you about $300.
Totally worth it if you're a Star Wars nut.
Here's a video: