But Black Susan, the cat, came and went as she pleased, day and night, through the swinging door of the cat-hole in the bottom of the front door. She always went very quickly, so the door would not catch her tail when it fell shut behind her.
One night when Pa was greasing the traps he watched Black Susan come in, and he said:
'There was once a man who had two cats, a big cat and a little cat.'
Laura and Mary ran to lean on his knees and hear the rest.
'He had two cats,' Pa repeated, 'a big cat and a little cat. So he made a big cat-hole in his door for the big cat. And then he made a little cat-hole for the little cat.'
There Pa stopped.
'But why couldn't the little cat-' Mary began.
'Because the big cat wouldn't let it,' Laura interrupted.
'Laura, that is very rude, You must never interrupt,' said Pa.
'But I see,' he said, 'that either one of you has more sense than the man who cut the two cat-holes in his door.'
Then he laid away the traps, and he took his fiddle out of its box and began to play. That was the best of all.
-from Little House in the big Woods