Time to learn how to be surprised in Korean!
어머 - Oh my!
This is used when you're shocked and can't form coherent words lol! You just have enough time to say "EO-MEO!"
깜짝이야 - Ahhh! I'm so surprised!
This is when someone or something scares/surprises you and you are like "omg you SCARED ME!"
오마이갓! - Oh my God!