To be on the Safe SideIn a cinema during a performance one of the audience gets up, makes his way along the row of seats and goes out into the foyer. A few minutes later he returns and asks the man sitting at the head of the row: "Excuse me, was it your foot I stepped on when I was going out a moment ago?" " Yes, but it doesn't really matter. It didn't hurt at all." "Oh, no, it isn't that. I only want to make sure that this is my row."