Yoi Ohanashi de WA!! in 英語コミュのgood one- How to handle Anger

There was a little boy with a bad temper. His father gave him a bag of
nails and told him that every time he lost his temper, he had to hammer
a nail in the back fence.

The first day, the boy had driven thirty-seven nails into the fence ..
Then it gradually dwindled down. He discovered it was easier to hold
his temper than to drive those nails into the fence. Finally the day
came when the boy did not loose his temper at all. He told his father
about it and the father suggested that the boy was to pull out one nail
for each day that he was able to hold his temper. The days passed and
the young boy was finally able to tell his father that all the nails
were gone.

The father took the son by the hand and led him to the fence.
"You have done well, my son", he said. "But look at the holes in
the fence. The fence will never be the same. When you say things
in anger, they leave a scar just like this one."