Pete Frates is the inspiration behind the "ALS Ice Bucket Challenge" craze. He was diagnosed with ALS back in 2011. Shortly thereafter, people started doing the Ice Bucket Challenge for different charities.
Pete wanted to do the challenge, but couldn't because of what ALS was already doing to HIS body.
Pete went on social media and asked people to do the "Ice Bucket Challenge" on his behalf and make a donation to ALS.
That's when the Ice Bucket Challenge went viral.