Off topic, but there was a semi pro baseball team in northern Virginia called the Prince William Cannons.
Odd that we do not speak of potato guns and such, but golf ball guns and baseball guns are ok. In my younger less wise days, in addition to d cell batteries, i also shot apple cores, pencil erasers, and some other miscellaneous stuff as projectiles.
the neatest alternative cannon fodder, I have actually seen, was at the High Plains rondy in 1994. As a kids game,, every afternoon, they loaded a couple pounds of penny candy in a cannon and fired that into an open commons area for the kids tto scramble after. Toddlers got a head start over the others.
Now, I had daydreamed of a load of loose fresh cow manure for the car of a neighbor that had offended me in some forgotten way. I envisioned a few larges platter marks, followed by an odorous brown mist decending upon the vehicle. (I found out that my step son had done something almost worse. He found liver thawing out in the kitchen for dinner and decided that the roof over that neighbor's patio would be a more fitting place than the family stomaches. Needless to say after a few days in the hot June sun, their patio was not a pleasant place.)