Via the tipline and Sam of Leisure, we’re reminded of the oddest D.C. ritual of the summer — doing a little dance as soon as the old school HBO theme music comes on at the start of any Screen on the Green screening. Sam explains:

This is my third year coming to SOTG, but I had to have someone explain to me the concept of the HBO Dance. When the HBO music comes on, scores of men and women are compelled into a dervish that looks like an aerobics move, waving their hands above their head while hopping. Or a 20 second rave, where everyone is high on Franzia.

We’re not sure exactly when or how this got started, but we’ve certainly seen it happen. This video is pretty darkly lit and hard to make out, but you’ll get the idea. Do you do the HBO Dance?