Let's just say, theoretically, that you're house/pet-sitting. For about a week and a half. You go over Sunday evening, all packed. Come Monday morning, you're getting ready for work, and you realize, oh crap! You forgot to pack your hairbrush! And you won't use your friends whose house you're at, because you're just twitchy like that. So, quick finger-comb, pull it into a pony tail, on goes the scarf, and voila! No one can tell.
This is all theoretical, of course, because no one, certainly not me, would ever forget to pack her hairbrush. *facepalm*