Usain Bolt and Mo Farah trade Olympics celebrations

Mo Farah and Usain Bolt head to the podium to trade celebrations on the final day of athletics at the London 2012 Olympics.

Double Olympic champion Farah does Bolt's 'lightning' celebration while Bolt, who won his third gold of the Games in the 4x100m relay, repays the favour by doing the 'Mobot'.

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