This has to be one of actor Paul Rudd's best, and as far as I'm concerned the epitome of the 'Bromance' genre... (which oddly enough used to be called a 'buddy-flick'... but no complaints from me with the new moniker )... If you haven't seen it yet, I highly recommend giving this movie a rental... or a download, whatever people do nowadays. For those not familiar with this movie, Paul Rudd basically plays a friendless fiancé hard-pressed to find a best-man for his upcoming wedding... ultimately leading to a series of comedic 'man-dates' concocted by Paul's gay brother Robbie (played by Andy Samberg of SNL fame). The movie itself gets pretty hilarious once Jason Segel's character comes into the mix... but I think Paul's date with actor Thomas Lemmon's character Doug probably stood out as my favorite scene.
Doug unfortunately doesn't land the role as the perfect 'bro'... but I guess he got close enough (at least for my tastes). But anyhow, I Love You Man is available on DVD, Netflix, and Amazon video streaming.