For a long time, yours truly was blissfully unaware that some people consider the illustrious '70s a flop decade for cinema. What?! ...Okay, yes, after the boom of the '60s, Hollywood was running out of money, and as a result, the 1970s produced some cheap flops. Some. But we also came out of the decade with timeless, exceedingly rewatchable classics like The Godfather and The Exorcist — movies that to this day remain part of essential film viewing canon.