You've probably seen the Lebowski poster if you own an IP address in the United States, but here's some other work from Mike Mitchell's portfolio.
Here's the beyond-infamous "I'm with CoCo" poster design that put Mike Mitchell on the map:
humble Reddit beginnings to becoming the official design for Conan's AmericanExpress-sponsored tour. The poster is still available here. ...And W.T.H. is this knockoff trying to pass off as? I guess it shows that everyone's trying to get a dollar these days.