My Dad taught us that "you pay just as much for the last drop in the bottle as you pay for the first drop".
I remember that every time I scrape out that last drop of mayonnaise or peanut butter or syrup.
This is my favorite of more than 40 here. I think of this every time I use my scrapper to clean out something or even put a few spoons of water in a jar, shake it well and add it to the soup.
If I can, I save a half cup or so of liquid from things I am blending. Then, when the blending is done, I pour that out, pour that half cup of liquid into the blender and blend a bit. Then pour that into the soup, cake, sauce or whatever.
Save every last drop!