Intriguing: I hadn't considered tone of voice, volume, etc. to be types of nonverbal communication before. Now that I think about it, they are similar to shrugging or rolling your eyes, as far as conveying a meaning indirectly.
Confusing: I'm still not sure how to make a perception check in a way that doesn't just make me sound like I'm missing the point entirely. How to say it is one thing, but it just seems overly blunt.