Steak and Shake is trying to break a Guinness World Record

Hi- I saw this on another site. Steak and Shake is trying to break a Guinness World Record tomorrow, 6/7 at noon. They are celebrating their 80th birthday tomorrow, and they are offering a new birthday cake shake for half price tomorrow, and they are trying to get 20,000 people together combined at all their locations, to have the largest happy birthday singalong, and try to break the record. It should be interesting.