Has certainly become something of a legend in film history and popular culture.
One of my favorite lines ever is in a pretty obscure movie called "The Friends of Eddie Coyle" with Robert Mitchum and Peter Boyle. I think the guy who said it was a late character actor named Richard Jordan. A couple of mindless hippies want to buy some guns to pull off a not particularly well planned heist, and Jordan's character, a low level hood, says: " This life's hard man, but it's HARDER if you're stupid!" You have to see the film...stlll, it's really simple but observant...