The old good one...

After digging to a depth of 100 metres last year, Russian scientists found traces of copper wire dating back 1000 years, and came to the conclusion that their ancestors already had a telephone network one thousand years ago.

 

So, not to be outdone, in the weeks that followed,
American scientists dug 200 metres and headlines in the US papers read: "US scientists have found traces of 2000 year old optical fibre, and have concluded that their ancestors already had advanced high-tech digital telephone 1000 years earlier than the Russians."

One week later, the Sowetan newspaper reported the following:
"After digging as deep as 500 metres, Zulu scientists have found absolutely nothing. They have concluded that 5000 years ago, their ancestors were already using wireless technology.