Hey, I want to believe... and I do believe there are intelligent beings elsewhere in the Universe... but the evidence that any of them of have visited us is, as Carl Sagan put it, crummy.

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Scully: Mulder, come on! We have intelligence on a shipment of drugs and guns from Colombia coming in at the docks tonight!
Mulder (snorts, rolls eyes): Scully, I hardly think the FBI is interested in that.

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"Slapping a guy on the head is just as funny now as it was eighty years ago."