Doctor, Nurse and Little Johnny.

A woman brings eight-year-old Little Johnny home and tells his mother that he was caught playing doctors and nurses with Mary, her eight-year-old daughter.

Little Johnny's mother says, 'Let's not be too harsh on them . they are bound to be curious about sex at that age.'

'Curious about sex?..' replies Mary's mother, '.. Fortunately I reached there on time... otherwise he was about to cut her stomach by knife to remove her appendix out!'