That confused 'Nani?!' exclamation that blew up online — it's basically the audio version of someone doing a double take. People throw it in when they want that comedic reaction sound, like when something totally unexpected just happened.
That confused 'Nani?!' exclamation that blew up online — it's basically the audio version of someone doing a double take. People throw it in when they want that comedic reaction sound, like when something totally unexpected just happened.