The foreman at the sawmill wasn't eager to hire the blind man because of the obvious risks involved

The foreman at the sawmill wasn't eager to hire the blind man because of
the obvious risks involved, but the guy begged for a chance. "You'll see,"
he said. "Just put me downstream of the saw and and I'll smell the type and
length of the lumber and stack it accordingly."

So the foreman agreed to give it a shot. Positioning the blind man, he
sent down a twelve-foot piece of pine. "Ahhh ..." said the man, breathing
in deeply, "pine, twelve-foot." And he stacked it in the right place. The
foreman repeated the test with oak and redwood, fir and mohagony, and the
blind guy didn't miss once. Then, getting a sly look on his face, the fore-
man sent for the office secretary, old Mabel, and told her to hike up her
skirts and ride down the conveyor belt.

Mabel rode through, faceup, right past the blind man. Sniffing furiously
and looking very puzzled, he asked that the last piece of wood be sent
through again. The foreman complied, but not before telling Mabel, skirt
still up, to turn over. After a few moments of reflection, the blind man
turned to the foreman with a with a triumphant smile. "I've got it!" he
proclaimed, "That's the shithouse door from a tuna boat!"