Big Sir: What you're peddling. It's dangerous.
Barry Allen: W-what's dangerous?
Big Sir: Hope. I've been in here long enough to understand that in prison, hope is the most dangerous thing.
Barry Allen: Wait, did you get that from "Shawshank"?
Big Sir: No. I got that from being in prison. Tell your friends to stop wasting their time.
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From: The Flash