Bobble Head

I guess I've been a bobble head most of my life. Not all of the time of course...just when there's music playing.
Saturday morning, Jeff and I were having breakfast at our favorite place...Sckvonnes. Unlike some restaurants, the background music there is totally unpredictable. Sometimes it's oldies, sometimes soft classic rock. Once in a while it's someones personal "garage band" recording...and occasionally it will be some middle eastern instrumental music. I think it might be chosen by whoever got to the CD player first...the cook...the waitress...the dishwasher. That's how it was in most of the restaurants I worked in. (One time I worked with this one dishwasher who only liked polka music. I listened to more polkas in the short time that we worked together, than ever in my life!) Anyway...this past Saturday it was early Beatles songs. In no time at all, Jeff and I were both swaying back and forth like a pair of metronomes. Our heads tipping to the left and to the right to the beat of the music. When the music stopped...we too were still. When the next song came on...so did we. Both of our heads bopping side to side. It was just an automatic response.
That got me wondering....when was it that my head stopped bopping side to side...and started bopping up and down? When did I stop being a side to side bobble head...and switch to being a head banging up and down bobble head? With a puzzled look on my face, I asked Jeff if he knew the answer. He was taking a drink of coffee at the time and I thought it was going to come spurting out his nose! When he quit laughing, he replied, "Whenever you started listening to Ted Nugent and AC/DC." He's right. That was it. They are definitely not side to side bobble head bands.
When our waitress came to the table with our food, I said, "We were just noticing that once upon a time...a long time ago...our heads bopped side to side with our music of choice...and then somewhere along the line, we switched to the head bopping up and down music...like this..." (And I demonstrated for her some mild head banging.) She said, "Oooh...I like the side to side bopping much better. The other would give me a headache." I'm guessing she's the one who got to the CD player first.
I wonder what will be playing there next time....