A cyan mare with a rainbow mane and tail walked into a tree library. The Pegasus went by the Rainbow Dash.
"Hey Twilight, do you have then newest Daring Do book?" she asked.
Twilight shook her head.
"Then what will I do until the book comes into stock?" she demanded. "I already practiced all my tricks billions of times!" she exclaimed.
The princess finally spoke up and asked, "So you like a challenge, right, Rainbow Dash?"
"Hell yeah!"
"Well then, let me give you the hardest challenge pony may ever encounter."
The flyer's eyes lit up in excitement. "What challenge?"
Twilight used her alicorn magic and levitated a book. She brought it next to her. The book had a bold title on it. It said The Periodic Table of Elements.
"I challenge you to learn every single element on The Periodic Table of Elements by heart." The lavender alicorn explained.
Rainbow then started a monologue, "I'm not sure if I could do that, Twilight. You see, according to me challenges go according to different categories.
"There's the egghead category, which is challenges for smart ponies. There's the sports challenge, which is for athletes like me. Then, there's the cooking and baking challenge, which is pretty much for cooks and bakers like Pinkie Pie and Applejack. Then there's the other category with the rest.
"But you know what? I'm willing to accept any challenge that anypony throws at me.
"Challenge accepted." Rainbow proudly announced. "So how will we start?"
"'We?'" Twilight Sparkle asked. "I wasn't planning to help you learn it. You will have to either learn it on your own, or you will have to find someone else to help you."
"Fine. See ya later!" Rainbow waved to Twilight with her hoof and flew out of the library.