Mom!

A small boy is sent to bed by his mother. Five minutes later, "Mom." "What?" "I'm thirsty. Can you bring me a glass of water?" "No. You had your chance. Lights out." [Five minutes later] "Mom." "What?" "I'm thirsty. Can I please have a glass of water?" "I told you no! If you ask again, I'll have to spank you!" [Five minutes later] "Mom!" "WHAT?!" "When you come in to spank me, can you bring me a glass of water?"