How does "guess what" function? Is it mostly used to make others to pay attention to what you're gonna say?

Native speaker’s answer
Rebecca
Good guess! That's right. It's a rhetorical question that's used to draw attention to what you're about to say. You can use this when you want to share something surprising, interesting, or exciting. Ex: Guess what? I just saw a cute dog on the street. Ex: Guess what? Lisa just got fired.