How to Prevent Racking Balls on Wrong End?

[TCo]

I guess you know when you don't have what would be considered a serious player's poolroom when virtually every day, someone that comes in here proceeds to rack the balls on the wrong end of the table.

Despite having the master spot at the head of the racking end, having a crosshair with a sharpie drawn on that end, having the headstring line drawn with a sharpie on the breaking end, and having the ball rack on the hook on the correct end of the table, it still happens all the time. All I can guess is they think the spot is there to put the CB on to break from.

Does anyone ever see that happen in your poolroom? I find it very frustrating, as it's generally quite embarrassing for the customers, to have to politely tell they are breaking from the wrong end. Is there anything else I can do, short of writing "break end" on the rail or on the cloth behind the headstring with a sharpie?

Best idea would be to go over while they're chalking up, take a picture of the rack, then slap it with your hands and tell them they're cheating.

If that doesn't work try acting human.