Rainbow had been minding her business, hanging out with Twilight and her friends, when Rarity made a comment about her dresses.
"Oh, I just love this design! It's to die for!"
Rainbow Dash thought that she should take a look. "Hmm, needs to be about twenty percent cooler."
"Ah! Rainbow Dash! How could you say such a thing?"
"What? I just think it could be cooler."
"Cooler? And what, pray tell did you have in mind for this dress?"
"I don't know...maybe a little less...frilly?"
"Less frilly?! Well I never! It seems to me like you wouldn't know 'cool' if it bit you in the flank!"
Rainbow Dash was now finished with her tale. Celestia had listened to every word, and was now laughing slightly.
"Yes, Rainbow Dash. I can see how that would be 'very' frustrating." Celestia said sarcastically.
"See what I mean?" Rainbow Dash said, unaware that the princess was joking. "I know I shouldn't be mad. She's my best friend, but...I just can't get over it."
"Well, if it really is that much of a bother for you, then I believe I have the perfect solution."
"Really, Princess Celestia?! You'll help me?" Rainbow Dash said, her hands cupping her face.
"Indeed I will. Follow me, if you would." With those words, Celestia changed direction, away from the throne room and down a corridor Rainbow Dash was at least eighty percent sure she'd never seen before. Then again, her and her friends were usually only here for important quests from the princess. They never really had any time to explore the castle.
Soon, Princess Celestia stopped at a fairly large wooden door. She looked at Rainbow Dash, a smile on her face.
"Welcome Rainbow Dash, to the newest addition to Equestria's Canterlot Castle. The Break Room!"
Rainbow had heard it all, but she was too busy staring at the huge expanse of door in front of her to care. It was huge. If there was anything she had ever called the most awesome thing she had ever seen, the sheer size of this door would blow it out of the water entirely.
Of course, that's simply what she thought.
In truth, the door was only as tall as the doors to the princess' quarters. It was the width of the door that was truly a marvel. It was three whole ponies wide and the lighting and Rainbow Dash's position below it made it seem even wider. Her mouth hung open in awe as Celestia looked at her, pleased with her reaction.
"I take it you like the room?" She said, already knowing the answer.
"Are you kidding me?! This is the most awesome thing i've ever seen!"
Celestia raised a hoof to get her to calm down. "I understand your excitement, Rainbow Dash. Even I was in awe at the finished product of this room. But, If you really wish to view something beyond your very comprehension, I implore you to have a look inside."
"Inside?"
Celestia simply nodded, and Rainbow Dash pushed open the door.
"Experience the true majesty of this room!" She heard Celestia yell in excitement behind her.