Celestia wants a quiet evening in.
Shining Armour wants a word with her.
These two things are, unfortunately, incompatible.
Because Shining Armour's words are all about his little sister, and her place in the monarchy.

Thanks go to S. Aitken, Celicam, Zerbin, Cloud Wander and Tisis Antony (aka, Mike) for their help. I'm forever in their debts.