A long time ago in a galaxy far, far away I had to give an impromptu presentation about something I didn’t know much about. The goal of the task was to see how well we could ad-lib a presentation under pressure. Everybody in the room had to think of a topic whilst waiting for our turn. The person next to me couldn’t think of anything and asked me what I had thought of, I said “the off-side rule” (it’s a football/soccer thing, don’t worry about it). Then that person was called befo...