How many times during the day do you do something, knowing full well that it will not make the slightest difference to the outcome... Not all those useless hours we spend at the photocopier or keyboard, or cleaning the loo, but, well, this sort of thing:

I was driving up to my local superstore, which is in a small industrial estate. To get onto this estate, there is a roadway with a height restriction bar across it. I've driven under it at least once a week for a year now, and still, every time I go under it, in my car, I duck my head... I mean, how stupid is that? Is me ducking my head going to make the slightest difference to the car's height? I'm in a car, I'm not going to hit my head, so why do I keep doing this redundant activity?

LTS