Pride comes before a fall? Zimbabwe's Robert Mugabe, 90, falls down podium steps after being greeted by his adoring supporters.Zimbabwe's president tripped as he walked down steps at the airport.Mugabe, new chairman of the African Union, was returning from Ethiopia. The leader, in power since 1987, had been greeted by adoring supporters. Mugabe whisked away in waiting limousine after the accident. Photographers who captured the fall asked to delete pictures, it is claimed.