The scissor blade from Kill la Kill...and I even have my own!!
Besides being a cool looking sword, the scissor blade is made of hardened life fibers and it is the only weapon that is capable of severing the life fibers that make the super-powered goku uniforms. Even though it was the weapon that was used to kill her father, Ryuko Matoi wields a scissor blade as she cuts through the students of honnouji academy.
And I also have my own version of Ryuko's scissor blade that I got for Christmas from one of my best friends. Now that I have a scissor blade in arms reach just hanging out in the corner of my room, I can honestly say that it looks awesome and that it is my favorite weapon from all of the anime that I have scene at this point.