Paul Newman in Butch Cassidy and the Sundance Kid
Bill freakin' Murray!
I stumbled across a Tumblr page earlier today, and have been wasting time at work (shh! don't tell!) going through the back pages.
Rides a Bike posts pictures of celebrities on bicycles. Some of the pictures are vintage, some recent. Some look like they are stills from movies, others appear to be behind the scenes, or promotional shots. All of them are awesome!