"Child sent to bed" joke

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?"