Absorbed in one of the books she was supposed to be shelving, Hermione jumped when someone pounded on the front door. Unsure what could possibly be so important, she dusted her hands off on her jeans and opened it.
It was Ron, that much was clear. Less clear was what exactly he was trying to say. Confusion written across her face, Hermione took a moment to process the words that had all run together, assisted by the fact that he repeated himself at the end.
Stepping back to allow him in, she still looked slightly confused. "Dinner at the Ministry? Tonight is only hours away..." Hermione didn't like last-minute things, she liked a lot of time to prepare. This was not a lot of time.
"And what do you mean you forgot?" she added as an afterthought.