Recently I watched a movie called Paper Man. Despite the trailer making him look like a handicapped older man, it is actually about a seriously distressed author who takes some time away in the country to sort of exorcise his demons and hopefully mend his dying marriage. He clearly is a little crazy though, as he regularly converses with his only (and imaginary) friend: a witty, self deprecating super hero named Captain Excellence. He meets a young girl, and decides to make her his friend. It's a little cliche at times, seemingly aware that it's an indie movie, but Jeff Daniels, Lisa Kudrow, Emma Stone, Keiran Culkin and Ryan Reynolds all play their characters splendidly and it certainly has it's moments. Worth a watch.
Or at least watch this.