Ope! is such a deeply ingrained part of my communication that most of the time I don’t even consciously register that I use it.
Y’all, midwesterners have the best Interjection for almost any situation (akin to how allora in Italian is an interjection that can mean almost anything): Ope! Surprised? Ope! Made a mistake? Ope! Calling to someone at a party from across the room? Ope! Accidentally offended? Ope! It’s great.