Thanks again Waterlaz... good call on this one!!
You are welcome

Oh I've forgot to mention 2 more anime movies which I can call my favorite. They are suited for a more grown up audience though.
1) Genshiken

It's about people who's life is mostly concentrated on watching anime, reading manga and hentai doujinshi(pornographic manga with characters from famous anime).

2) Welcome to NHK!

The main character here is a hikikomori. He lives on his parents' money. He doesn't work(22 yrs old). He doesn't have any friends and comes out of his house only late at night when nobody can see him to buy some food.
He believes that all his troubles come from NHK. Originaly it's a Japaniese Broadcasting Corporation but he is convinced that this is a secret corporation with the only goal to make everybody else a hikikomori. And he suspects everyone in being their agent.