1 Tom learned a trick at the playground: Just say to any adult "I know your secret" with a knowing air and they'll pay you to keep your mouth shut
2 so Tom said to Dad: "Dad, I know your secret" and Dad said: "Oh God! Son, don't tell your mom!" And Dad gave Tom $10
then Tom said to Mom: "Mom, I know your secret" and Mom said: "Oh God! Son, don't tell your Dad!" And Mom gave Tom $10
that evening when the priest visited Tom said to him: "I know your secret!" And the priest answered: "Goodness me, my son - I never thought your mom would tell! Whatever you do, my dear son, don't tell your Dad!" And the priest gave Tom $100 and promised more
yes, moderately irreverent...but humour comes in all shapes and sizes...