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in the episode The Reclusive Potential
Sheldon: Do you have any mail for Dr. Sheldon Cooper?
Mailman: I do, but I can't hand it right to you. I have to put it in the box.
Sheldon: And that is what separates the U.S. Postal Service from those hippies at FedEx.
This helps us figure out whether you are a human or a cyborg.