THOUSAND OAKS, CAInternet user Paula Challey was insulted by the simplicity of a quiz that popped up on her computer desktop Monday. 'I mean, come onit offers me a prize if I can identify whether a picture is of Britney Spears, Madonna, or Paris Hilton,' Challey said. 'I'm a college graduate, for Christ's sake. Give me a real challenge! If these quizzes are this easy, I don't see the point in them.' Challey then moved to the more formidable task of using her mouse to shoot an animated duck for the chance to win $100. 