"Ain't It Fun" captures the feeling of moving out and facing the real world, born from Hayley Williams's own experience of relocating and the attitude that came with it. The song, written by Williams and Taylor York, started with a keyboard loop and grew to include diverse instruments like marimba and bass guitar, even featuring a six-member gospel choir. It's a song that embraces the musical diversity that critics praised, reflecting a journey of self-discovery and the challenges of independence. Playing it can feel like a declaration of newfound freedom, tinged with the wry humor of life's lessons.