I got this idea from something my mum said when she ate most of my sister's caramel popcorn and the put the remaining kernels in the little tupperware box. While coming up with the sketch version, I knew I had to bring in the annoying, ever-optimistic bear and a reference to the "half empty vs half full" idea. And how the notion that everything is half full can come around to bite your bottom. Yes, the cynicism only gets worse.
ps - Assuming that no one can figure out what the drawings are because, let's face it, it looks like they could be holding just about anything in their "hands"- In frame 2, the bear transfers the chocolate milk from the glass to a smaller glass. And in the final frame, the shark transfers the remaining popcorn into a smaller box.