Bob: slaps his stomach repeatedly and quickly
Jeanne: What's that sound?
Bob: (stops slapping) I was slapping my stomach.
Jeanne: Why are you doing that?
Bob: I saw a boxer on TV. To get him ready for matches, his trainer hits him in the stomach with a round stick.
Jeanne: Please don't get any more weird about physical fitness!
Bob: heh heh heh.