Every time my son walks into the room he says "Hello". I try to tell him he is going to use them "hellos" all up and when he really needs one there won't be any left. For some reason he won't believe me. I tried to get my wife to back me up on this...... well she just gave me one of those looks. Then she said that saying hello was pretty much the same as a wave of the hand. There is always another wave. But that the wave of the hand could also mean goodbye. And it hit me.
By this time my son was sitting on the floor. I told him to go ahead a lie down on the floor. I told him to say "ha". He said "ha". I asked my wife if she knew what that was. She looked puzzled and shook her head no.
I told her it was, "A low ha"