I'm looking for a word or phrase that describes the specific type of word-play or idiom in these examples::
- The movie Rocky Horror Picture Show is so bad that it's good.
- Chinese Crested Hairless dogs are so ugly they're cute.
- Eating these high-fat triple-chocolate brownies is so right that it's wrong.
(BTW: The above are not my actual opinions, just examples of the usage I am asking about!)
I had thought about chiasmus, but it doesn't fit exactly. Any other ideas?