Making the cat Happy

Little Johnny is outside swirling a cat above his head by it's tail.
Hearing the awful noise the cat makes, his mom runs out of the house, yelling at him "What are you doing?!"
He replies calmly, "I'm making the cat happy".
"How could you be possibly making that cat happy like that?" asking the stupefied mom.
"Not now," says Johnny, "when I put him down!"