Too people who don't understand the 'Humpty Dumpty' in the background, that is Beelzebub from Yondemasu yo Azazel-san, and his ability called Divulgence which gives him the power to make others reveal their hidden selves ranging from revealing the side of them they don't want people to see, to forced defecation. That should pretty much explain everything. lmao
Go to the parent post and click the post link someone put in. This is an extra frame to a comic about Yukari tricking Chen into thinking Ran's head is becoming massive as her body shrinks.