The image of Cameroon’s Sports Minister Pierre Ismael Bidoung Mpkatt bowing and shaking the hand of President Paul Biya went viral.
The hashtags #BidoungChallenge and #CourberdosChallenge meaning to bend the back, have been included in 11,000 tweets.
People in Cameroon have been recreating the image as well photoshopping the original on social media.
One user on Twitter added some geometry to illustrate the angle and distance of the bow to the subject.