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.
(..) If she pulls her own weight, I got no problem with it. No split-tail's getting through this program. No way, Jose. Oh, man, doesn't she know it's rude to point? Whoo-hoo! Look, I don't know what she did to get in here. I hate to speculate. I know I petitioned for two years to get into this program. (..)1997 G.I. Jane