A bunch of dudes decided to test the patience of the United State Postal Service by (sorta) anonymously mailing bizarre, unwieldy, disgusting, or suspicious objects and seeing how many went through. The result: most of them!
This one is my favorite:
Never-opened small bottle of spring water. We observed the street corner box surreptitiously the following day upon mail collection. After puzzling briefly over this item, the postal carrier removed the mailing label and drank the contents of the bottle over the course of a few blocks as he worked his route.
(i stole this link from wondermark and i do not regret it)