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.
(..) Dialogue: Marked=..,Default,NTP,!Effect,That's what's under the trap door.\NThe Sorcerer's Stone. Dialogue: Marked=..,Default,NTP,!Effect,Oh, hello, sorry, don't wish to be rude,\Nbut l'm in no fit state to entertain today. Dialogue: Marked=..,Default,NTP,!Effect,We know about the Sorcerer's Stone. (..)2001 Harry Potter and the Sorcerer's Stone