An oldie but a goodie.
The Royal Society commissioned an archiologist to excavate in a remote location in north east England. After digging to a depth of 10 feet, the team discovered a length of cooper wire. The next day the Royal Society announced that the English had a rudimentary telephony system dating to 1800's.
Not to be outdone, the Smithsonian commissioned a similar team to dig in south west US and discovered similar cooper wires at depth of 15 feet. The team announced that the US had a telephony system dating back to 1700's.
Inspired by this, Kevin Jones of Kalgoolie got out his shovel and started digging up his back yard. He dug 25 feet and found f#$k all. The next day, he sent a letter to the CSIRO stating that Australia had gone wireless even before European settlement.
Bo