A warning has gone out to charities to keep an eye on their collection boxes.
It comes after around £100-worth of notes was taken from the charity box at the Bike Museum in Kirk Michael.
Secretary of the Isle of Man section of the Vintage Motor Cycle Club, Tony East, says they're very disappointed at the theft as virtually all of their visitors are bikers, and most of the money they collect is for the Riders Association which helps injured riders and their families.