Mamma mia, let me go....

Today, my sister and I went out for lunch (surprise, surprise!). While we were there, "Bohemian Rhapsody" came on so I started singing along. My sister seemed surprised that a) I knew what song it was and b) I knew many of the words. At one point in the song, I tend to start headbanging. I didn't today because at that moment the waitress started walking over. I am sure my sister is glad that I restrained myself though it did feel odd.