A couple of other good ones from films:

"You keep using that word. I do not think it means what you think it means." (The Princess Bride)

"Why did you come to Casablanca, Rick?"
"I came for the waters."
"There are no waters in Casablanca."
"I was misinformed."
(Casablanca)

"He'll regret it to his dying day, if ever he lives that long." (The Quiet Man)


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All we can do is all we can do.