This is the Calvin and Hobbes no one saw. Partly because, I am sure, it is not the end the author truly intended, but an ending that the pessimistic people of the world saw and re-drew. There was one that didn't mention medication at all, but spoke of focus and responsibility. When he was talking to Hobbes and asking him a question and Hobbes didn't answer he asked why, looked over and then actually saw Hobbes as a stuffed animal...

That one was more heartbreaking. More real.