Seven men chipping tiles with hammers .
There is a better than even chance that a group of men wearing yellow hard hats are chipping away at some tile .
There is a better than even chance that a group of men wearing yellow hard hats are chipping away at some tile .
It is impossible that a group of men wearing yellow hard hats are chipping away at some tile .
A group of men wearing yellow hard hats are chipping away at some tile .