Now that is one fun project, and it already amassed enough money to get funded!

With Sabertron, swordsmen & swordswomen will be able to have sword fights with swords that keep score electronically, without any additional equipment. A series of LED strips integrated into the front and back of the handle keep track of player health. A sword-to-sword hit doesn’t decrement health. A hit to the body of an opponent results in a loss of health until a fighter wins the duel.

[Sabertron: Foam Swords with Electronic Scoring]