Day of the Wacko (2002)
Amazing movie about a miserable man who hates everyone, and everything, including himself.
Probably deserves even higher than the 8.0/10 rating it's got on IMDB. I voted it a 10.
Here is a link to a review which sums it it quite well: http://www.efilmcritic.com/review.ph...238&reviewer=1