it was a one-off, but probably only because the opportunity has only ever arisen once.
If you are driving very slowly in 1st gear, to get to the garage so they can fix whatever it was that broke as you were driving home, meaning that you could not change gear, do not absent-mindedly turn, on autopilot, into your front gateway, particularly if the driveway is too small to allow you turn around without having to use reverse gear. (the garage was about 3/4 mile past our house. Our gateway was quite awkward, and trying to work out how to get the truck into the driveway, in such a way that it could get the car out, when there wasn't space to turn around was... interesting. And may have involved having to stand in the road stopping traffic for a while.
My grandfather - if you have painstakingly trimmed and sliced a vast quantity of runner beans, make sure, before taking the trimmings out and throwing them on the compost heap, that you have in fact picked up the bowl of tops and strings, not the bowl of sliced beans... If you don't, you will spend the net half hour picking sliced runner beans out of the grass clippings, and your family will not be wholly sympathetic.