The acting is the scariest part of this one.

This movie is a guilty pleasure.

When your conjoined twin is a monstrous telepathic tumor that shouldn't have survived the separation, horror shenanigans ensue in early 80s New York (the look is definitely late 70s though). That's Basket Case, fore the most part a fun, camp gorefest featuring a memorable, if not always effective, monster. The creature's futile rape fantasies are certainly part of the squishiness, but the movie also doesn't mind looking silly (the stop motion sequence is particularly ridiculous). No great acting, indeed the cast tends to overact most things, but they're given things to say that makes them distinctive characters. The dialog is quirky and adds to the camp, so what might feel like an error in other films, here feels like it's all part of the style. I do think the movie gets a bit screamy in the second half, to the point where I would have expected the downstairs neighbors to call the police if they'd been home. I'm not big on screaming. Sensitive ears. But overall an entertaining creature feature.