Light sabres, sadly, don't exist yet, so what's the next best thing? A crazy, taser-like-charged lightning sword, of course. One man made it his mission to create it, without being fried -- this is the result.
The sword has a mains-charged taser built into the handle, which can be primed and then used to send arcs of electricity searing between the two separated metal blades of the sword. It sounds like the arcs of a light sabre when it goes off, and even better when striking another sword. Let's just say I wouldn't want to get hit by that thing; it looks like it bloody hurts. [Reddit via Technabob via Dvice]