What day is it?When Aaron Samuels asked that fateful question back in the 2004 movie "Mean Girls," Cady Heron — played by Lindsay Lohan — memorably responded, "It's October 3rd."It was the line that launched more memes and GIFs than Regina George got candygrams, and Oct. 3 —unofficially dubbed "Mean Girls Day" by the Internet — has become the day to celebrate. Even the Obama campaign got i
