Cisco Ramon: Wait a second, how do we know which one's the real Barry?
Past-Barry: Dude. Okay, I've watched Wrath of Khan with you, like, five times.
Cisco Ramon: Imposter!
Future-Barry: Yeah. And every time at the end, you turn to me and you say "I have been and always shall be your friend".
Cisco Ramon: Ah ha! You imposter!
Cisco Ramon: What is going on here?
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From: The Flash