<p>Some of the world's fastest and most exotic cars tore out of San Francisco on Thursday night for the start of a mad cross-country caper that's as much about hard driving as hedonistic partying.</p>
<p>But the West Coast debut of the Gumball Rally, a notorious European road race marked by eye-popping speeding tickets, five-digit bar bills and the champagne-soaked antics of the effortlessly wealthy, resulted almost immediately in a police crackdown.</p>
