I found this film quite depressing rather than funny. It sort of gives you a lonely feeling while you're watching, as the protagonist documents his sad everyday life. The moments when David is with his girlfriend Penny, it feels very real; so real that it's scary as you witness their relationship fall apart due to David's narcissism. Definitely an underrated film worth checking out. It contains one of the longest monologues I've ever heard and is sort of educational in a way.