What is your favourite Anime?

What is your favourite Anime/Ecchi/Hentai?.

My favourite anime would have to be One Piece. Though it has a rather slow start and at times may sometimes end up rather booring the overall anime is superb and funny as hell . Especially when Luffy notices somethings he thinks is amazing ^^.

Please feel free to tell me about your favourite anime , be it mainstream or underground hipster ^^.