The Ice Bucket Challenge went viral 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 great cause . . .
You have to eat a lemon wedge and record yourself reacting to how sour it is. Then you challenge another person to eat a lemon wedge.
It's a little easier than dumping a bucket of ice water over your head. 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
DIPG is a type of brain cancer that attacks the brain stem. And it tends to affect little kids. (It stands for Diffuse Intrinsic Pontine Glioma.)
An 11-year-old in Alabama named Aubreigh Nicholas was diagnosed last September, and started the challenge by daring Alabama football coach Nick Saban to do it. Below Coach Saban answers the challenge