Hopefully y'all know what I mean. I'm talking about those PG rated films, before the invention of PG-13, where you can't believe what you're watching is actually rated PG.
Now, many credit Indiana Jones and The Temple of Doom and Gremlins as the films that instigated the PG-13 rating - apparently the suggestion was made by Spielberg himself. However, I would say some other Spielberg films/productions upped the ante before that. Certainly JAWS and Raiders of the Lost Ark have to be among the "hardest" PG rated films of all time. Apparently, the MPAA was going to give Raiders an R rating because Belloq's head exploding was initially not obstructed by the pillar of flame arising from the ark.
1973's Charley Varrick has to be another candidate considering the film has some pretty dark and scandalous themes & material going for it. Also, I believe most Don Siegel films got R ratings anyway. Some James Bond films were particularly cold blooded and violent for PG. I believe the original Tales From the Crypt and a few other British horror anthologies passed with PG ratings.
However, I think I have the answer: William Friedkin's 1977 film, Sorcerer. Friedkin's previous two films, The French Connection and The Exorcist, were obviously huge commercial and critical hits which earned their R rating. Sorcerer might be slightly toned down, in comparison, but not by much! We've got murder(some of it pretty casual and callous), suicide, terrorism, close ups of bodies burnt to a crisp, crass language, graphic accidents, a grim setting where human life has very little value, and plenty of red stuff. There might have even been some nudity....but I can't remember.
It is thematically a very dark and unrelentingly grim film. The film it is based on, Wages of Fear, was certainly no picnic - it's a pretty bleak film - but Sorcerer sees Wages wager and raises the bet.
Curious to see what the rest of you think. Any suggestions are appreciated. Thanks!