You can't beat World War II for crazy technological innovations. People worked on anything from shark repellent to exploding rats to bombs that would drift across the Pacific ocean on the wind. Unfortunately, there were also cat bombs.
This page from a 1584 treatise on explosive weaponry reveals two of the 16th century's more mobile methods of destruction: the cat bomb and the bird bomb, apparently used to set buildings on fire. BibliOdyssey has more fiery weapons from this manuscript, the rest of which are safer for friends of felines.