This reminds me of an old legend from a semiconductor company where I used to work. You used to have to test your ESD protection (grounding heel/wrist straps) w

This reminds me of an old legend from a semiconductor company where I used to work. You used to have to test your ESD protection (grounding heel/wrist straps) with an ohmmeter and log it to a notebook before going out to the factory floor to be sure that you wouldn't zap anything. Engineers being engineers, someone analyzed the log data and discovered that the skin resistance of female workers tended to vary on a monthly cycle, and you could predict these cycles based on empirical data. This soon spread around the office. At some point HR got involved and shut it down. The ohmmeter was replaced with a red/green light.