Okay, as long as we’re resurrecting this thread, I’ve got a new one to add:
Superman 4.
It was on TV the other day and I watched most of it out of boredom. I’m still trying to replace the lost brain cells.
There has been only one movie I have sat through in the theater where the entire audience turned it into our own private MST3K. That movie was Lifeforce. But Mathila May was amazingly naked in it so it can’t be the worst.