I Am a Tapper

I am a tapper. I tip tap tappy tap my feet all day long. I try not to, but it comes out, a rapid metronome. Where does this come from? My dad is a clapper and a snapper. He also is a slapper, he'll do a snap clap and smack his thigh when he is in high spirits -- when he feels glad to be alive. I don't think my mom taps, claps, snaps, or smacks. My dad's mother, she whistled. When I tap my feet, it is not because I am glad to be alive, but because I am thinking fast & furiously -- trying to solve problems. So I tap under stress. Where does it come from, I ask again. I do not know.