The most impressive thing about 'My Idiot Brother' is that it accomplishes something few films deem important these days: It makes you want to be a better person. So, it's hard to fault the film, which carries with it a few speed bumps and an ending that feels a bit too cookie-cutter, because it just plain makes you feel good. From the story to the performances to the many unexpected moments of hilarity and heartache, there's a reason why 'My Idiot Brother' is one of the biggest (and most well-received) films at this year's Sundance Film Festival, and it begins (and ends) with one of Paul Rudd's greatest roles.

Rudd plays Ned, a hippie with a heart of gold who lives out on a farm with his hippie girlfriend, growing produce (and marijuana) while enjoying a quiet life full of farmers' markets and downtime hanging with his dog, Willie Nelson. But Ned isn't exactly playing with a full deck, and when he sells pot to a uniformed police officer, Ned is arrested, thrown in jail and replaced on the farm by another hippie boyfriend who's just as nice and honest as Ned. This little inconvenience forces Ned to leave the farm and shack up with each of his three New York City–based sisters (Elizabeth Banks, Emily Mortimer and Zooey Deschanel), who soon realize that their idiot brother is the best and worst thing to ever happen to them.