If you think this job is going to be easy, you're in for a 'rude shock'. [=you will be unpleasantly shocked when you find out that this job is not easy at all]
He's about to have a 'rude awakening'. [=he's about to find out something that will shock him unpleasantly]
I was 'rudely' [=suddenly and unpleasantly] awakened from my nap.
(..) No, not everything. But the important things, yes. And then everything else, you get to decide all by yourself? - Don't be rude. - I'm sorry. Just trying to figure out what you do for fun. What do you mean? I mean... (..)2004 The Notebook