Soylent Green (1973)

Soylent Green is the final film in the Last Man Standing science fiction trilogy that Charlton Heston made in the late 60s/early 70s and it manages to be creepily interesting despite his presence. The movie takes place in 2022 (via 1973), it's tense, has an edgy story, and some far out scenes (including the scooper and Edward G. Robinson's final scene). Once you've seen it, you'll never EVER forget what Soylent Green is.

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...Airport 1975 (1974)

A classic in the disaster film genre, Airport '75 is unwittingly funny and wickedly campy. The actors are trying so hard to make the script work but it is really Karen Black, Gloria Swanson and Myrna Loy who come out smelling like a bouqet of roses. Helen Reddy sings a ridiculous song she wrote to Linda Blair, Charlton Heston does his hero shtick, and George Kennedy returns for the second of four Airport films but no one (and nothing) makes this turkey unwatchable.

...Skyjacked (1972)

There are so many missteps in Skyjacked, a tensionless thriller about the hijacking of a passenger jetliner to Moscow, that I am listing a few:

1. The passengers are told they are being hijacked because of a bomb and they just sit - no screams, no cries
   


2. Yvette Mimieux as head stewardess makes a comment about it just being a bomb
   


3. The voice of character actor John Fiedler, very well-known for his high-pitch, is dubbed by someone with a lower range
   


4. Mariette Hartley gives birth naturally on the plane with no pain killers and, again, no screams


5. James Brolin's use of the word nigger twice and Rosey Grier's acceptance of it
   

Sure, this list might be considered more than three lines (even though I opted to use no periods - which grammatically you can do) but I wanted to make clear that this self-titled Cult Camp Classic is neither classic nor campy nor surrounded by cultish viewers; it's just bad.