The mistake that toppled the Berlin Wall

One of the Cold War's biggest moments began at a routine press conference. Become a Video Lab member! http://bit.ly/video-lab The fall of the Berlin Wall has a lot of memorable moments: US President Ronald Reagan's declaration to "tear down this wall"; David Hasselhoff singing at the Brandenburg Gate; and Berliners wielding pickaxes and hammers, tearing apart the visible symbol of a divided Europe.