So I Wanted to Play Jokes on Chung Tzu

So I wanted to play jokes on Chung Tzu. I call him up at 1 AM.
"Hello, Chung Tzu? Are you awake?"
"Yes," says Chung Tzu. "And how are you?"
"Fine." I say.
I call him up at 2 AM.
"Hello, Chung Tzu? Are you awake?"
"Yes," says Chung Tzu. "And how are you?"
"Fine." I say.
I call him this way and get the same response at 3 AM and 4 AM. Chung Tzu is no fun, he is no tease.
Chung Tzu comes over that morning, bight and early for breakfast. I am very tired & hung-over. When I see him, I say, "Hello, Chung Tzu? Are you awake?"
"Yes," says Chung Tzu. "And how are you?"
"Fine." I say.