#5 The Big Lebowski
I'm not sure if one can have a "most essential Coen brothers" list without including The Big Lebowski. With its oddball dialogue, quirky characters, and trippy dream sequences, this has become a stoner comedy must-see. Featuring Jeff Bridges as "The Dude," The Big Lebowski is a film that, well, kind of needs to be seen to be believed. It still Coen trademarks, like a kidnapping, a ransom, and a plan for double-crossing, but experienced through the eyes of a post-smoking bowler. It's genius, and if you don't like it, well, you know, that's just, like, your opinion, man.