True story...
I played one session of APA
years ago without knowing what I was getting myself into.
My first game of 8-ball I was about to make the 8 and the captain screamed for a timeout and explained that I had to "mark" my very obvious pocket.
A bit confused but willing to play along, I pulled out my wallet and placed it next to the pocket. I was told that for some inexplicable reason, neither the wallet or any kind of money was allowed as a marker.
To the horror of half the players there, I replaced my wallet with the small .380 pocket pistol I was carrying and made my shot.
I didn't last long in APA...