I woke up today with an old children’s song stuck in my head. We had a few friends over Sunday – the first lovely weekend afternoon in a very long time – so recalling a traditional, repetitive folk/drinking song in my dreams may have been the result of too much folk and drink. You’ve heard it: “If you’re happy and you know it, clap your hands. If you’re happy and you know it, then your face will surely show it … (blah, blah, blah) … clap your hands.” Wikipedia says the song first appeared in a 1938 Soviet musical comedy called “Volga-Volga,” which centers around a group of amateur performers sailing on a…