Can’t - At Night...

A motorist,  after being bogged down in a muddy road,
paid a passing farmer fifty dollars to  pull him out
with his tractor.

After he was back on dry ground he said to the farmer,
"At those prices, I should think you would be pulling people
out of the mud night and day."

"Can't," replied the farmer.
 " At night I haul water  for the hole."