Trixie is a pony of many talents. Some of them are just less developed than others. Remembering names is one such talent. But, she tries, and sometimes she even gets it right!
Today however was not one such time. Coming to Twilight with her hat in her hands (Metaphorically, for she'd never reduce her own glorious hat to a common cap), Trixie came to ask if, hypothetically, Trixie accidentally shrunk her assistant and stuck her in a jar, would Twilight possibly be able to undo that. Of course, part of charming the almost-equally amazing alicorn was to win over her niece, and that meant addressing her by her full title.
Unfortunately for Trixie - and later Twilight - Trixie had to make her best guess at remembering the younger princess's name. She didn't get it right.
For the rest of the day, Flurry heart would only answer to "Blurry Fart."
Old idea I had sitting around for a while. Broke it out while trying to get the juices flowing for a commission last night. One thing led to another, and here we are.
Twilight is going to spend the rest of the day dealing with raucous princess giggles and the same joke over and over again, and she knows it.