Or when you do something that I do all the time:
I'm at point A, and need to go do something at point C, but there's some item at point A that needs to go to point B, and since I will pass point B on the way to point C, I take the item with me, thus saving time by making only one trip. When I arrive at point C, I realize that I still have the item in my hand, and I know that if I put it down, I will forget it, and having it lying around at point C instead of at point A - not really an improvement on the situation. So I must now take the item back to point B. When I arrive at point B, something there needs to be done, then something else, then I go back to doing whatever it was that I was doing at point A that I interrupted to make the trip to point C, and then I remember what I needed to do at point C, so I head off to do it . . . . . .
No wonder I never get anything done - but I'll bet I rack up some impressive mileage.
I resemble that