When I was younger, I would go visit my Grandparents at their home. They would usually have interesting "toys" to play with. I remember that they got this battery powered flower in a flower pot with a guitar that would react to sound. Whenever you played the music it would twist, turn, and bebop with the music instantly.
Well, I just discovered that I have one of those in my house. Anytime there is a song, a beat or rythem Joe will suddenly start gently beboping without warning weather he is eating or playing. I had no idea he even paid attention to my la de da do da bum bum bum etc. But when the music starts he wiggles. When it stops he stops. Same expression on his face, same way he plays with his toy, just a little wiggle bop. Funny.