"I'm Thirsty" joke

His father sends a small boy to bed.
Five minutes later....
"Da-ad...."
"What?"
"I'm thirsty. Can you bring 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-aaaad... "
"WHAT!"
"When you come in to spank me, can you bring a drink of water?"