HA! Think "The Ripper" from UT! There was a movie a long time ago starring Dolph Lundgren...he was a cop tracking down this alien drug dealer. The drug dealer would always say "I come in peace" before killing his victims.
The drug dealing alien had this weapon. It was essentially a metal CD Rom that flew under it's own power and was attracted by the human body. I.E. you couldn't hide from it. The disc cut thru wood, metal and obviously was really good at decapitating people.
I can just see my installing my 325x speed CD Rom, loading a CD in there, it spins up, sounds like a dentist drill gone mad and the CD Rom shoots out of there, bounces off all the walls, decapitating me before becoming lodged in one of my PM speakers...just like in the movie! Wow!
Oh man, I got way out there, didn't I? Sorry, no intelligent input from me, this time. 😀