What happens when I leave the bottom of my break jump cue in the pocket after my inning is over and my opponent makes a shot an the cue ball goes round the table and is going to go into the pocket but it hits my break jump butt sitting in the pocket and the cue ball stays on the table?
What would happen if my opponent shoots an object ball toward the pocket where I left my break jump butt and the OB hits the protruding butt left in the pocket and caroms into the pocket (it might have hit the point and not gone in)?
The what ifs can go on forever. I've seen players pushing the envelope (taking the only piece of chalk off of the table, putting their hands really close to a cluster of balls as they are leaving the table, knocking chalk onto the floor, throwing their cue stick on the floor, etc.) just to get their opponent out of sync. By the time enough of these "distractions" are compounded, the distracted player has no chance of playing their regular game and calling a foul at that time does the honest player no good.
JoeyA
That was already covered Joey.

The situation is covered in CSI rules, Applied Ruling 1-3, Situation 3:
Situation: Player A, preparing to shoot a jump shot, unscrews the extended butt from their jump-break cue and places it in a pocket. They then forget that the butt is in the pocket and leave it there after their inning. Player B shoots and a ball (a) rebounds from the pocket; (b) is pocketed despite the presence of the butt.
Ruling: (a) foul on Player A; (b) The result of the shot stands and the game continues.
Discussion: With the exception of chalk left on the rail, if equipment used by a player and left at the table directly interferes with their opponent’s shot, it is a foul on the player that left the equipment. If a player leaves equipment at the table and it is discovered before it interferes with the game, or if it interacts with the balls during a shot without causing a disadvantage to the opponent, it shall be removed without penalty, but a warning may be issued.