Crowds yell 'Fool! Fool!' as the flamboyant billionaire steps down amid intense pressure from financial markets and Eurozone turmoil, leaving a trail of sex scandals and embarrassing gaffes.Europe's economic "Arab Spring" toppled another leader Saturday night as Italian Prime Minister Silvio Berlusconi, beaten down by days of political turmoil and intense pressure from financial markets, resigned to catcalls and shouts of "Fool!