Shawshanking is the act of reacting with appalled disbelief because someone hasn't seen a movie that it is considered a classic.
Originated with someone having not seen The Shawshank Redemption, but can be applied to any movie.
"I haven't seen Poltergeist."
"YOU HAVEN'T SEEN POLTERGEIST?!"
"You're Shawshanking me!"
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