in person? Ben Roethlisberger. The biggest spoiled little kid I've ever met was ~25 years old and actually said, verbatim, "Do you know who I am?" when a bouncer wouldn't let him and his entourage cut in front of a line of 50+ people to get into a night club. It was both hilarious and nauseating. After Ben stormed off (with the obligatory "I'll talk to your boss" threats), people were tipping the doorman for the entertainment.