Butch Cassidy and the Sundance Kid

You could do worse than catch Redford and Newman in one of the funniest if slightest Westerns of recent years. Unashamedly escapist, it rips off most of its plot (from pursuit to final shootout) and much of its visual style from Peckinpah's The Wild Bunch, and even parodies Jules and Jim. It's slightly the worse for some of the borrowings, but the script is often hilarious, Newman and Redford making the best use of it when they get to parry dialogue with each other (eg, during the pursuit). It is much better and funnier than the The Sting precisely because it allows the two stars to play off each other.