While Katy Perry usually remains pretty tame and polite in front of paparazzi, the 'Hot N Cold' songstress just couldn't keep her cool back in 2010. Perry was clearly agitated by their presence (especially when one guy told her "I thought you'd be a lot taller in person") from the get go, but things got heated when they wouldn't let Perry exit a parking garage. First, she pounded on her horn for what seemed like a lifetime, but when she rolled down her window, paps must've known they were about to get an earful -- and boy, did this 'California Gurl' deliver a quick and painful verbal lashing.