work out the angle of launch, the amount of energy involed in launch, the length of launch (travel), the flick required at the end of travel of launch (well in this they have to spin) allow for atmospherics, inebriation, calls of cheat and tolerances of launch factors which would also be required... the math ain't easy
and if you tried all that at a two-up game, you'd be "taken out the back"
