How should I punish my girlfriend?

Perhaps some of you are familiar with the submissive-dominant lifestyle. Keep in mind that this is something she's okay with and encourages. So, what happened is, she publically questioned my authority, which is strictly forbidden. (all in good fun, though, this isn't a fight or anything) So, I'm obligated to punish her for disobedience. I need a NON ABUSIVE AND RESPECTFUL punishment. No hitting or name calling, just something unpleasant and creative. I just need a few ideas to build on so I can come up with something good. Any ideas?