serving them through glass windows

She tells me that when I was still in the crib, my father hung a mobile of tennis balls above my head and encouraged me to slap at them with a ping-pong paddle he'd taped to my hand. When I was three he gave me a sawed-off racket and told me to hit whatever I wanted. I specialized in salt shakers. I liked serving them through glass windows. I aced the dog. My father never got mad. He got mad about many things, but never about hitting something hard with a racket.

-- Open by Andre Agassi