@CNN: You may remember “planking” and the mannequin challenge. Now, the “invisible box challenge” is taking social media by storm. https://t.co/JPd3iQup4w https://t.co/gie0t0jtxk

@CNN: You may remember “planking” and the mannequin challenge. Now, the “invisible box challenge” is taking social media by storm. https://t.co/JPd3iQup4w https://t.co/gie0t0jtxk