The Underboob pen challenge first swept across China and now has taken the internet by storm. In this challenge, women have to stick their pens under their breasts and post the selfie on social media, which will apparently prove their womanhood.
Millions of images have been shared on the internet with a caption, “Pass the challenge to prove you’re a true woman.” Here's an introductory course:
Strange Craze Of Underboob Pen Challenge Takes The Internet By Storm