I am far from OCD. Very far from it! But there are certain things that will bother me for days if I waste even a little bit. (Oddly, money ISN'T one of them). Sometimes it might be because I have run out before and hope to avoid that as long as possible. Buts thats a guess. If I smoke a cigarette I either won't stop until its all gone, or I'll put it up and save it. Even if there's only 2 or 3 drags left, I always smoke it before I light another one. My husband threw one out that was almost half of a cigarette. When I was about to pick it up off the ground I realized how fanatic I am about it. If there is any coffee in the pot after I'm done with it for the day, it goes in a cup, in the fridge. I'll heat it up and add more to it in the morning. And, the last one I can think of at the moment, is alcohol. It doesn't matter what it is, liquor or beer. If there is enough for just one swig, it goes in the fridge until the next time I drink. Do you have anything like that?