I like the idea of a paradox gun. Sounds like something off the Hitchhikers Guide to the Galaxy.

"The paradox gun. Developed, it is believed, on Nonyfrirt 7 in the Egglusian galaxy by Gunther Rankenbankenwanken. The principle is that instead of killing people it simply confuses them by shooting inexplicable parodoxes into their thought patterns. It worked perfectly well and stopped many enemies from causing wanton destruction until the Z'nhars of Z'naharthia tried to use it on an invading force of Wallonshoosh guerillas who, being unable to understand thought process, took the gun and used it to beat out the brains of their enemies."

:D