(True story: I once spoke to fellow who makes custom swords - he was making one for me, in fact - and listened to him complain about some of the design requests he gets. The one that particularly worried him was a request for a double-bladed weapon, not unlike Darth Maul's lightsaber, with a katana blade on either end of the central handle. The blades would have their edges aligned in opposite directions, giving the weapon overall a slight "S" shape. This would essentially guarantee that any horizontal slash with the lead blade would automatically and unavoidably carry the rear blade into the owner's body, sharp-edge first.)
Traditional designs may not look as exciting as fantasy weapons, but there are good reasons why they became traditional. Not killing the people who were trying to use them was a big part of that process.
This is still funny, though: