I kindasorta expected someone to mention "spud guns" in the line throwing thing also. Two things to remember about spud guns, if you use spray starter fluid to power them: Too much spray can, and will, blow them up, and using igjited starter spray to power them makes them, by definition, a firearm. You just became an unlicensed firearm manufacturer, and created a firearm with a bore much larger than is legal (.50 cal/10 gauge is the max allowed), probable with no serial number. Expect the ATF to be knocking on your door as soon as someone complains about the spud thru their window. And if you are caught with it in your vehicle, expect the ATF to take, and keep, the vehicle.

Much fun as spud guns are, they are NOT a good idea...