Bert and Max are great friends and they always go shopping together in the mornings.
Bert calls to Max as he makes his way to the kitchen. He sees Max with a tin of black boot polish and a cloth applying the polish on his p+++s.
What are you doing Max?
Well, said Max, on the radio this morning the announcer said to do it.
Oh my gawd Max, you need to get your hearing tested. The announcer said 'remember to turn your clock back'.