Every day, at exactly the same time, Margaret would go to the bathroom cabinet, open it, and take out a huge bottle of castor oil. Then she would head to the kitchen to get a tablespoon. At the sound of the drawer opening and the silverware rattling, Patches, her Yorkshire terrier, would run and hide—sometimes under the bed, at other times in the bathtub or behind Margaret’s recliner.

Someone had convinced Margaret that Patches would have strong teeth, a beautiful coat, and a long life if she gave him a spoonful of castor oil every day. So, as an act of love every twenty-four hours, she cornered Patches, pinned him down, pried open his mouth, and poured a tablespoon of castor oil down his little doggie throat. Neither Patches nor Margaret enjoyed their daily wrestling match.

Then one day, in the middle of their battle royal, with one sideways kick, Patches sent the dreaded bottle of castor oil flying across the kitchen floor. It was a momentary victory for the canine, as Margaret let him go so she could run to the pantry and grab a towel to clean up the mess.

When Margaret got back, she was utterly shocked. There was Patches licking up the spilled castor oil with a look of satisfaction only a dog can make. Margaret began to laugh uncontrollably. In one moment, it all made sense. Patches liked castor oil. He just hated being pinned down and having it poured down his throat.
Welcome to the world of evangelism!

—Kevin G. Harney, Seismic Shifts (Zondervan, 2005)
Larson, C. B., & Ten Elshof, P. (2008). 1001 illustrations that connect (59–60). Grand Rapids, MI: Zondervan Publishing House.