Okay - not a joke but it had me chuckling...
I was waiting for the lift outside of the radiation oncology clinic at the new Royal Adelaide this morning and actually looked around for a change. They have sketched murals on the walls between the lifts and I saw that one of the main elements was a hair clipper and thought to myself - Oh! That's interesting and fitting for where it is... Then I picked out the other parts of the murals - cattle dog, motor bike, barbed wire...they weren't meant to be hair clippers - they were sheep shears!!!