Opportunity was not only knocking, it was laughing like a hyena and pounding its head against a wall last week as Rigolatte -- the man known for locking himself in the men's room at Our Favorite Starbucks and belting out opera tunes for hours on end -- tried out a new role, that of Svengali. He walked right up to Barista Chelsea and offered to make her a star. "You have potential, kid," he crooned, "With your looks and talent I could make you a Singing Sensation!" Witnesses say Chelsea smiled sweetly and took it all in stride. As for Rigolatte, rumor has it he's already landed Chelsea her first gig: A solo performance at the ladies room at Pavilions ...!