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.
(..) - You don't fully understand. - Trust me on this. All right. Excuse me? Little fella? Hello. Don't be rude. Say hi. Don't be rude. Say hi. Hello. - His son Bingo... - Nemo. - ..was taken to... (..)2003 Finding Nemo