The most ridiculous rule is having to call the ball going in "clean" or not. When I first heard it I thought they meant not hitting another ball, what they meant is that you had to call the rail or facing if the ball was going to contact it. They really wanted to get their money's worth out of those games.
I was alone, avoiding trouble to avoid a fight and maybe a visit to a local jail which would probably result in a fine that happened to amount to everything I had on me. I was making a loop, from near Baton Rouge LA, up into Mississippi and Arkansas maybe a bit of Tennnessee or Alabama, then drop down to the gulf coast and follow it back west to get home again.
Most places had similar rules to what I played in bars in Baton Rouge but that trip across the upper part of the gulf coast states tried my patience so bad I never went thataway to gamble again! "Call everything." "You didn't call brushing the rail before it went in." "You didn't call hitting the inner rail." I am pretty sure I got called for running over the spot a time or two without calling it! I had to keep reminding myself that I was making money everywhere I found an action table. Might have been a few dollars or might have been pretty nice. Thing was, after learning one set of weird rules I would go two miles down the road and be met with a whole nuther set of rules!
One of my favorite "strange rules" was concerning the last ball and the eight when playing eight ball. Some places were just call the eight and pocket and it was legal. Some the object ball had to fall in the pocket first.
I have to admit that after a few road trips I delighted in catching strangers with the screwed up rules of my local bar. "That's not the way we do it in Houston!" "You aren't in Houston."
On the road I had learned never to pass up a pool table, a nothing looking spot might yield the biggest score of the trip. Mostly I just had to beat them with whatever rules they threw at me including some I knew they were creating on the spot and snickering at the dumb stranger. The dumb stranger was still winning more than he was losing and it was fun to catch them with their own rule later in the session. One thing I forgot about, the eight ball. Some places you have to bank the eight, some places you have to pocket the eight in the same pocket you pocketed your last ball in. Some places, sometimes you have to do both!
Hu