Wavelength (1983)
This sci fi movie with telepathic child-like aliens (sans clothes) starring Robert Carradine and Cherie Currie entranced me and my brother as kids during its many replays on HBO. I recently rediscovered it and think it would be perfect Rifftrax fodder because:
1: Co-stars Keenan Wynn as an actual grizzled prospector
2: Intersperses extended dialog-free scenes, sometimes in poorly lit places, with dull military discussions in an underground base/lab that looks suspiciously like an industrial plant
3: Soundtrack by Tangerine Dream
4 (bonus): Fun boom mike appearances
Available at: https://youtu.be/KP8jrXY00-Y
More info: https://en.wikipedia.org/wiki/Wavelength_(1983_film) & https://www.imdb.com/title/tt0086571/
Also, there is a claim that this is "a totally true story": http://thesecret-sun2.blogspot.com/2013/06/highly-strange-cinema-wavelength-1983.html
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Vic commented
Truly good riffing material. I mean an amateur could do some riffing on a number of the scenes. For example, it opens with a slow pan of three people in tubes while playing a wounded whale soundtrack. I liked that the top-secret base was in a neighborhood. Scenes where the dog is smarter than the characters and voiceovers/narrations that often don't make sense...and the random guitar smashing!
If your problem is you can spot tormented souls at 100 yards, as one-character states, the last place you'd want to be is in an 80's bar!
Just so many whacked out bits...a riff goldmine IMHO.