The Verdict
Cool Hand Luke.
Butch Cassidy and the Sundance Kid
Two Lane Blacktop.
Godfather I and II
If you want to not watch politically correct watch any of the Dolemite movies.
Harold and Maude
It's a Mad Mad Mad world
Spider Baby or the Maddest Story Ever Told. (Lon Cheney Jr and Sid Haig is in it.)
Marty (1955)
Good call on IT's a mad, mad mad world. CLASSIC.
My suggestions:
Rollerball
Kelly's Heroes
Zulu