At primary school (really? primary school? christ on a bike, what was he like?) Johnny Bull invented a "game" he called "movie cameras", based on those old-fangled cameras that needed a big black sheet that the cameraman (or photographer) would hide under to be able to see things in the viewfinder. The "game" involved Johnny, somehow or other, persuading one of the girls in the class (names withheld to protect the not-so-innocent) to sit on a wall in the playground with her legs apart, whereupon he would kneel between said legs with his head under her skirt, and then make winding motions with one hand as if he were controlling an old-fangled movie camera. I'm not quite sure what he did with his other hand, on reflection.