Every now and then someone makes something so completely outside-the-box, impractical-yet-cool, gotta-have-it unnecessary that I have to have one. This completely meets all of the above, except for the "I have to have one" bit.

Excellent! Perfect for the upcoming Zombie Apocalypse!

That so has to end up in a movie! :-)

Give it a second blade that will rotate counter the first one, attach them together somehow so that when they both rotate they counter each others centripetal forces and I bet you can get a pretty decent range on that thing.

Could give you a nasty infection :-)

Ahahahaha awesome! I was going to say this is a weapon for a Zombie apocalypses 8))) Perhaps inspired by the "Dead Island" game eh?

It is unfortunate that Gizmag is giving this pinhead visibility and a platform from which other morons will be inspired to emulate this unsafe toy. In many ways this newsitem is not that conceptually far from the unfortunate bungee cord jumping "Innovator" who kept adding length until he managed to do a face-plant from 100 feet with 105 feet of bungee cord. It is a matter of time until some moron actually trys this out, maybe with spinning, flaming blades..?? ooh! Another Darwin Award Candidate Opportunity!

A standard crossbow bolt would be much more lethal. Show me something that will shoot 7" saw blades, and then I will be impressed.

That laser needs to be sighted. It seems like it's a bit high or the drop off rate for this pretty quick for the range. Doesn't seem like it would be effective against zombies, but the special effects for using it would make for exciting video for a zombie movie.

It is not really an improvement over the traditional crossbow. It's useless. Now come up with a self cocking crossbow and you would have something worth mass production.