A small boy is sent to bed by his father... 

[Five minutes later]  

"Da-ad..."  

"What?"  

"I'm thirsty. Can you bring me a drink of water?"  

"No. You had your chance. Lights out."  

[Five minutes later]  

"Da-aaaad..."  

"WHAT?"  

"I'm THIRSTY...Can I have a drink of water??"  

"I told you NO! If you ask again I'll have to spank you!!"  

[Five minutes later]  

"Daaaa-aaaAAAAD..."  

"WHAT??!!"  

"When you come in to spank me, can you bring me a drink of water?"