That I can switch off the rain sensing automatic mode on the intermittent setting of the car's windscreen wipers. It's never worked like it should and always seemed to be at the wrong speed, no matter which of the five positions you selected on the stalk. Also it would occasionally go into constant mode when there were only spots of rain or fail to speed up in spray or as the rain increased.
By accident I found a menu setting to return it to a fixed time between wipes, with the five positions on the stalk actually changing the time gaps.
I've only owned the car for nine years!