Coulda sworn the IotD covered this guy before, but I couldn't find it. Anyway, the guy on the right there has been painting his ball. For a very long time.
He started by painting a regulation baseball with a coat of paint in 1977; he found that he enjoyed it so much that he kept on coating it, regularly. And now it has over 18,000 coats of paint.
So the guy on the right there - an arborist by trade - is taking a "core sample" of the painted ball, to kinda sorta verify that it IS a baseball with 18,000 coats of paint for the Guinness folks.