The Ice Bucket Challenge went viral about four years ago, and raised $115 million to fight ALS. Now something called the "Lemon Face Challenge" is trying to do the same thing for another good cause . . .You have to eat a lemon wedge and record yourself reacting to how sour it is. Then you challenge at least one other person to do it. But if you don't want to do it, you're supposed to donate to a group called Aubreigh's Army to help fight DIPG.