What is the rule on committing a foul? I was in a situation that was somewhat relaxed while playing pool. People leave the room for various reasons and come back and sometimes the game has been started. I have had opponents commit a foul, not tell anybody, and not know it till a couple shots later when someone else brings it up, and this happened while folks were a bit away from the table taken care of simple tasks. Should players who knowingly commit a foul, call it on themselves? Especially after his opponent returns to the table? Keep in mind this is a two-bit fun tournament we play every now and then.