SNSD / Girls' Generation's Yuri, 4minute's Hyuna, Kara's Goo Hara, and T-ara's Hyo Min got together for a midnight dance. They all danced to Lee Hyori's hit single U Go Girl. T-ara's Hyomin also had an embarrassing moment on Invincible Youth. It was revealed that Hyomin is the silent but deadly type as her farts have no sound but a deadly smell. One night during filming the girls noticed a nasty smell in the air and they figured out it was Hyomin. To defend herself Hyomin stated that "Well You Can Smell it, but you can't hear it!" Check out the hilarious late night dancing below, thanks to Mia for the tip. Also thanks to *YANiPOPO* @ tiaradiadem.com for sharing the farting tip.