Doctor: I am sorry I can't treat your ailment!
Patient: Why doctor? Is it that serious?
Doctor: No. Your ailment was not covered in my medical study book.
Patient, trembling in fear: Which book was that?
Doctor: How to become doctor in 30 days!
A boy says to his friend, "Today my test results are out and my dad is at home. If I fail in one subject, text me saying ‘good morning to you’. If I fail in two, text me ‘Good morning to you and to your dad.’"
His friend agreed. Minutes later the boy gets a text from his friend. “Good morning to you and to your family and to your neighbors also!"