Can be from any genre. Mine is when an acoustic guitar comes in towards the end of a song and totally changes or reframes the mood/energy (see "Money" by Widowspeak)
This one is probably very specific but Utada Hikaru has one that I love, where towards the end of certain songs she sings the chrous, and then keeps the same melody going multiple times but with different lyrics. It's like she extends the feeling and rhythm of the chorus but keeps it interesting by using different lyrics the whole time. Some examples: Goodbye Happiness, Making Love, About Me, LETTERS, Sakura DROPS.