Lest the Brits think we're picking on them and their weapon designs, let's examine some of the laughable American designs. My submission is the infamous Bat Bomb...
Conceived by a dentist, the idea was to drop a non-explosive bat-filled canister which, after being slowed by a parachute, would disperse the bats, each of which was fitted with a tiny napalm charge. The bats would roost in the mostly wooden structures in Japan and cause widespread fires.
Actually, like the Panjandrum, it was a pretty good idea in concept. Much better targeting and wider deployment than possible with conventional bombing, it seemed perfect though the opinion of the bats was not tested.