Quote Originally Posted by Clevernick View Post
P.S. I gave two cases where these rules can be broken. One is in spoken dialogue, because people don't have to speak grammatically.

The other is when you're a bestselling author and you don't have to listen to pedants.

I don't agree that there are other times.
Maybe (just maybe, I don't really want to encourage anyone to break grammer rules just for the fun of it) you could add first person narrative here, which is - in some aspects - very close to spoken dialogue. To describe intense or complicated emotions, one often needs to employ stylistic elements like an elipsis or a climax and ends up with one of the don'ts you listed. The important point there is not to overdo it.