As if the sight wasn't enough to send the girls into hysterics, Nayeon decided to pull on her underwear to expose her butt cheeks. Sana was trying so hard to lift her upper body off the couch but couldn't. She could feel the cold air against her bottom and her head filled with shame. She suddenly felt self-concious and wanted this to stop so she could cover herself. The girls couldn't help but laugh at her helplessness. (Or Nayeon, Momo, Jihyo, Mina, and Tzuyu get back at Sana by pulling down her shorts.)

The other girls noticed and asked them what was going on. Tzuyu felt her heart racing, knowing that Sana was going to tell them what she had seen. And obviously she did. "Tzuyu doesn't want me to see her flabby belly," she told them, giggling. (Or Nayeon, Momo, Sana, and Jihyo expose Tzuyu's belly and she gets all embarrassed.)