Reese Witherspoon will do just about anything for charity. During an appearance on The Ellen DeGeneres Show on Wednesday, the Big Little Lies actress played a fun round of "Speak Out" to get the host to donate $10,000 to the Child Mind Institute, which raises awareness for children's mental health. The game had Reese wearing a hideous mouthguard and trying to talk while Ellen guessed what she was saying. Even though she had a little bit of trouble pronouncing phrases like "fuzzy ferrets are better than bald beagles," Reese handled the whole thing like a pro as she expertly used hand signals to help the host out. Get ready to do a spit take as you watch the hilarious video above.