I've used this one before but I love it
____________________________________________________________________________________________
British, German and Israeli archaeologists were digging their homelands to research early forms of communication.
The British archaeologist dug 100 yards and found a system of strings dating back 3000 years that connected ancient villages. He concluded that 3000 years ago Britain had the first form of prompt communication.
Then the German archaeologist dug 160 yards and found a system of copper wires dating back 7000 years that connected ancient cities. He concluded that 7000 years ago Germany had the first form of Morse code communication.
The Israeli archaeologist dug 100 yards and found nothing. He dug 200 yards and found nothing, 300 the same. At 400 yards he found a 12,000 year old site.. and still nothing. He concluded that 12,000 years ago Israel had cellular phone technology.