The Bat People (1974) We open with some supposedly scary images of bats, personally they look adorable. And then cut to a man rolling around clutching his neck, while having a nightmare. Cue credits, with spooky theme song.
We're out in a desert/cactus type area, a little bit of mansplaining/exposition, woman scared by bat, man heroic by throwing rocks at it. After this, presumably foreshadowing, they take a tour of a cave. Subtle this ain't. Kathy (the wife) falls down part of the cave, this annoys the man.
I think it's worth quoting, in full, the IMDB summary:
"After being bitten by a bat in a cave, a doctor undergoes an accelerating transformation into a man-bat, which ruins his vacation and causes considerable distress for his wife."
Arrgghhh, bats !!! Johnny (our main man) has been bitten! More nightmares by Johnny as they appear to up a ski-lift. Look I don't understand either. Just run with it. Some nice tinkly piano music while they go skiing, and more chair lift action, this time with flute ! And we cut to a hot pool in the snow where Johnny and Kathy are sipping cocktails. Johnny chokes on his drink, and cuts himself. We all feel his pain.
After some more exposition and general 'don't be a silly woman' type comments from the doctor, we see Johnny turning into a Bat-person.
Johnny is admitted to the hospital and attacks a nurse, then goes on the lam by stealing an ambulance, which leads to a dull car chase. He holes up with (tickbox alert) a garrulous drunk who dispenses folksy wisdom. Things got a bit slow around here so I did the ironing.
Let's cut to Johnny going back into the cave, and Kathy wandering aimlessly around town at night.
More crap happens. It's been rather dull.