In my hometown of Gainesville, Florida, a man was hospitalized after trying to shoot a squirrel with a .40 S&W cartridge taped to the end of the barrel of a BB gun. The cartridge exploded, striking him with fragments.
This genius, a felon prohibited from owning real firearms, claims he was trying to kill a squirrel for dinner. Well, the BB gun involved, a Crosman 760 Pumpmaster, is capable of killing a squirrel without additional help. Or it would be easy enough to catch squirrels in a havahart trap, for that matter.