This reminds me of when I've run out of butter.. I tell myself I haven't and I take the knife and try under the lid, ok a bit there. Then I try all the bits I think I can see. Then madly just take the knife and scrape every section. By now I have covered the bottom right and far right sides of my slice of toast, but that's it.

... Then I make a public announcement that I will butter the top left side with a whole lot of butter