Frank says:

Throwing objects such as this are capable of damaging expensive musical equipment and musicians. Any more of this and there will be no more music. -- FZ, Autumn 1981 at Northrup auditorium in Minneapolis, Minnesota. After someone threw a plunger on stage about two-thirds of the way through the show, he stopped the band with a wave of his hand speaking in the general direction that the dangerous object was thrown, while holding it in his hand. This did not prove to be an amusing act and Franks mood hardened. - It was, however, an evening of excellent, serious musicianship around the release of 'Shut up and play your guitar'