In SBS's Family Outing Season 2 (aka FO2) which aired March 7th, the family struggled in the mud to earn the title of honorary citizen. After being covered with mud, the seven members showered chaotically.
When Yoona visited the women's bath and went on a scale, Shin Bongsun quickly shouted "48.5 kg (approx. 106.52 lbs)!" Kim Wonhee joined along and embarrassed Yoona by saying, "If you take out the weight of the wet clothes, she'll be around 47 kg (approx 103.62 lbs)."
Shin Bongsun mentioned, "Yoona, you're so thin. I'm not going to weigh myself. Thanks for letting us see your weight," and was not able to hold in her astonishment. Kim Wonhee also weighed herself, but managed to be quick and hid her weight before the camera had the chance to film.
Yoona whined, "What is this~" and Shin Bongsun scolded, "What do you mean? You're the one who went up there (on the scale)."