👉 Guess what? Yep, it’s just a super common way to grab someone’s attention before dropping some news, be it good, bad, shocking, or funny. 💡 ¿Qué crees? is generally more direct and immediate than ¿Y qué crees?, which has more storytelling flair.

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But it doesn’t always mean “Guess what?”...You see, ¿qué crees? can also be used when you’re about to give someone bad, inconvenient, or disappointing news. Here's how to politely ruin someone's plans... — ¿Tienes tiempo para al ratito?
— No, ¿qué crees? Que no tengo tiempo.
— Are you free later?
— No, I'm afraid I don't have time. So yeah, in this context, it’s more like I'm afraid… / So… / etc. Oh, and that extra que is VERY often (but not always!) used to introduce the bad news! See this exact example in action in the Adán the Mariachi Voces episode at 2:38!