It's an offhand remark, “You're only young once,” but for Twilight Sparkle it strikes an unsettling chord. After all, everypony has to grow up; and when ponies grow up, they move away; and when they move away, they fall out of touch...

Terrified that her friends are going to drop out of her life, Twilight resolves to spend every waking moment with them. She also gives up sleeping.

This can only end well.

Dedicated to absent friends, to all our times together, and to reunions yet to come. Don't ever stop being awesome.