Film is so much to do with perfection and how differently you can feel about someone at the beginning of the film and the end of the film.
I have a nervous breakdown in the film and in one scene I get to stand at the top of the stairs waving an empty sherry bottle which is, of course, a typical scene from my daily life, so isn't much of a stretch.
We've got people looking at our seamy side and our sad side a lot of the time because that's easier. It's much more difficult to make a film about happiness with lots of jokes in it.