I was playing one pocket and my opponent has a ball deep in his pocket. I softly shoot to make his hanging ball, and while the cue ball is in motion his ball falls into the pocket and the cue ball scratches right after in the same pocket. I have never seen anything like this happen before. Not sure what the rule is on something like this because it has never come up before. I end up with a foul having to spot up a ball, and he spots his ball back in the jaws of the pocket, and takes ball in hand in the kitchen and ends up running out. Needless to say my wallet was not very happy. I can look back and laugh about it now.