I had a 1978 Oldsmobile Starfire, I couldn't put it into reverse (manual transmission) because the linkage would stick, so I'd have to crawl under the car with a screwdriver and a hammer and bang it free, you should have seen the look on my boyfriend's face the first time I forgot about it with him in the car and ask him to hand me the tools from the glove box!
My older brother got to drive our 76 Chrysler LeBaron, he figured out that there was a gap in the cushions middle of the back seat, just the right size for a beer can, and you could fit basically a whole case of beer in there where it would go into the body of the back seat so that if the cops came to where you were hanging out with your buddies and shined their lights into the car, they wouldn't see the beer and you wouldn't get busted for drinking (it was the 80s, yeah, they were stupid), but that all came to an end when he twisted the drive shaft out of it trying to screech the tires by revving the engine in neutral and then dropping it into drive (not a manual transmission)!