May I call you "Gorefather of 3dgs"? laugh

How about a spud gun?
http://en.wikipedia.org/wiki/Spud_Gun

Imagine loads of big and colorful lacerations (de: Platzwunden / means "bursted wounds") wink
And you could integrate this into the gameplay as well. It would annoy the zombies, but it won´t eliminate them.

no science involved