Can I Get a Glass of Water?

A misbehaving young boy is sent to bed early by his father. Five minutes later the child called out, “Da-a-a-ad!”
“What?”
“I’m thirsty. Can you bring me a glass of water?”
“No. You had your chance. Lights out.”
Five minutes later: “Da-aaaad!”
“What?!”
“I’m thirsty! Can I have a glass of water?”
“I told you NO!” If you ask again, I’ll spank you!!”
Five minutes later: “Daaaa-aaaad!”
“What?!”
“When you come in to spank me, can you bring a glass of water?”