I chuckle at all the people who say their swords. Cheap knockoffs are not cool, and I doubt many of you can afford to buy real, hand-forged, working swords.
Coolest thing I own? Hard to choose. I have a voice-activated, heat/sound/movement-sensing R2D2 Astromech Droid. I also have two very old, 17th Century Spanish epées, both branded with the coat of arms of the Toledo family. It's hard to choose between those and the also authentic, 17th Century basket-hilt sword I have. It's too long to be a rapier, and too thin to be a broadsword. But it's gold embossed and awesome.