I don't like literary theory, I can't imagine what would that be like..
That's my own sentence, but I've got no idea how to correct this.
In your comment you mention that the context is:
I was talking with my course mate, we were discussing the Literary Theory course and I'm quite bad at literature, the sentence was what I said
In this case all you have to do is switch would and that to make:
I don't like literary theory, I can't imagine what that would be like.