At one place I worked we had a team agreement that it was ok to do small pranks to people who left machines unlocked. Often small changes can have huge benefit

At one place I worked we had a team agreement that it was ok to do small pranks to people who left machines unlocked. Often small changes can have huge benefits, the smallest effective security hack I can remember was a one word change: We changed "last person to leave for x activates lock" to "first person to leave for x activates lock".