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.
In Canterlot, there is the district of Canterwell. In Canterwell, there is a flat. In that flat live Octavia and Vinyl Scratch. This is a day in their lives.