Diet Coke celebrates their 30th birthday by throwing 30 second birthday parties for fans!

Diet Coke is spreading happiness, and this time it's to celebrate their 30th birthday and their fans! Diet Coke fanatics could tweet to @DietCokeUS with a chance to be surprised, not only with a 30 second birthday party, but also a year supply of Diet Coke. Watch the video below of fan's celebration. Check out their YouTube site to see more birthday party celebrations.