How are the horizons of the possible shifted when shoppers in a Queens, NY grocery store suddenly burst into song? The intrepid folks at Improv Everywhere (with a song co-written by my old college pal Scott Brown) do their best to find out. It's not as elaborate as their earlier Food Court Musical, but perhaps more charming for its simplicity. You can't choose a better venue for the meeting of human longing and material abundance than a supermarket.