I prefer things that go boom!
The golf ball is essential. Seriously, chrono this, post the numbers and you could seriously transform golf.
Do your homework, check your state and local laws for restrictions on such things (many modern subdivisions have a "no cannons" covenant). Don't mix blackpowder with tequila, alpacas or enclosed areas. But there are directions on the net on a number of legal, family-friendly, build this science experiment in your garage kind of websites and there are even golf ball cannons for sale, that look like something out of Bladerunner (and are about $280 and up).
FORE!!
Almost 1000 feet. You couldn't even see it go. A quick sponge out with the world's biggest home made Q-tip to to extinguish any burning powder remnants and cool the interior a bit and it was time for strike 2.
Of course, the successful first strike raised the question.
What would this thing do with aircraft gun sights? Then, with sights, you could take it deer hunting. Kill AND gut the deer in one. . . . . (one stop shopping)