Works when the tables are arranged in a three-sides-of-a-square formation. While the teacher is out the room, one person is nominated to select desks in or desks out , which is written down and passed around the room once the teacher returns. This may seem fairly pointless, but it adds to the general feeling of naughtniess. Every time the teacher turns his back to write on the board, everyone should move their tables in or out, according to the mandate. Some teachers can be extraordinarily slow to catch on to this, and therefore it can be quite upsetting for them to realise that no-one's been paying attention at all, and have been simply laughing for the last ten minutes.

(We had one teacher, who was especially slow to notice, and coupled with our sliding of the whiteboard just out of his reach, he would break down into tears. His name was Phylis.)