When I was a young college student, I was sitting in the balcony of our chapel, waiting for some event to start. Another female student suggested we pass the time by selecting a boy below and staring at the back of his head. There were probably 4 or 5 of us, all female.

We did this several times, and it was remarkable how a boy who was sitting silently, looking forward, would suddenly wriggle his shoulders, then turn and survy the room behind him. I don't remember if they looked up to the balcony or not.

(We were supposed to call them 'men,' but we didn't. We knew them too well.)