We used to play it that whoever made the 1 or 15 first in the side made it so the other player then had to make his in the opposite side. This was an added strategy so that if your opponent's ball was close to the side pocket, you would try to make your's there so he would then have to now cross sides. The cue ball went in the kitchen back in those days on an off the table scratch and no real penalty except loss of turn if you hit your opponent's ball first or otherwise table scratched on a bar table. We used to spot a ball or "owe" one on a scratch at the pool hall. Last pocket and 1-15 in the sides was a good way to get your money's worth. Funny how the rules have changed so much and prices on everything else have gone up, but it still only costs $.50 a game most places.