A small boy is sent to bed by his father.

Five minutes later, "Da-ad..."

"What?"

"I'm thirsty. Can you bring 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 smack you!"

Five minutes later: "Daaaa-aaaad..."

"WHAT!"

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