Burns: You Know, Smithers, I Think I'll Donate A Million Dollars To The Local Orphanage.

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Burns: You know, Smithers, I think I'll donate a million dollars to
the local orphanage...when pigs fly!
[They laugh. The pig sails across the sky before them.]
Smithers: Will you be donating that million dollars now, Sir?
Burns: Nooo, I'd still prefer not.
-- Going back on his word, "Lisa the Vegetarian"