has viral sensation sofie dossi turned her torso twisting into a family business. >>> and later, cliffiving. a 90-foot drop at more than 50 miles per hour. we're on the jagged edge of the irish coast for the red bull cliff diving world series. >> it's like hitting concrete. it's hard. >> one wrong move could be their last. this is a special presentation of "nightline." pushing the limits. here now, dan harris. >>> thank you for joining us. it was the viral sensation that sent a chill down our spines and raised millions for als. we begin with the story behind the remarkable young man who inspired the ice bucket challenge. you may have wondered whatever happened to all that money and awareness that was raised. was it all just a silly craze, or as pete frates' many friends will tell you, was it a game changer. my "nightline" co-anchor juju chang has the story. >> reporter: it began with a simple idea. fill a bucket with water, throw in some ice, and -- >> ah! >> reporter: in the summer of 2014, the ice bucket challenge flooded the internet. from saintly irish nuns -- >> i accept the chall

sofie dossi is a 16-year-old contortionist and viral video sensation.ntire family is getting in on the act. here's abc's diane macedo. >> reporter: if you ever come across a girl running like a spider, twisting her body like a human pretzel, or eating a hamburger with her feet, there's a good chance it's sofie dossi. a 16-year-old contortionist and youtube sensation, with more than 1.6 million subscribers. she has the unique ability to fold her body like a jack knife, spin from a hoop suspended in the air and shoot an arrow with her toes. sofie is completely self-taught, draining in gymnastics and dance, but realizing she had a different calling. >> the world can't get enough of you. what do you think attracted this to you? >> i always loved gymnastics and dance. it was combining those two things together. >> when you realize you were more flexible than the average person? >> i realized i was unique when i saw the contortionists from circumstance due so hque du sol. >> reporter: she hit it big on america's got talent, quickly winning over the judges, ev