None really, there are no films that I would not admit to. If a group were talking about a film and all agreed it was one of the worst films in the world, and I liked it, then I would say.
Beyond the Valley of the Dolls is one that seems to be incredibly cheesy and embarrasing for some to admit? I loved it.
Howard the Duck - that terrified the bejeebus out of me when I was little. The monster aliens at the end are still one of my most frightening memories.