The back fence.

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, to hammer a nail in the back fence.
By the end of the firs day the boy had driven 37 nails into the fence. Over time, the boy decided it was easier to hold his temper than to drive nails into fence posts.
Finally, a day came when the boy didn't lose his temper. When he told his father, he congratulated him, and told the boy to pull out one nail each day he didn't lose his temper. Weeks passed and one day the young boy told his father that all the nails were gone. The father took his son by the hand and led him to the fence.
"You have done well, my son, but look at the holes. The fence will never be the same. When you say things in anger, they leave scars just like these. A verbal wound is as bad as a physical one."
-GENA WILLIAMSON