What's the biggest difference between Korean and European fans? According to Teen Top, its the use of underwear during concerts.According to an J-pop Asia, Teen Top members Niel and Changjo were guests on an upcoming episode of SBS' "Challenge 1000 Songs".With the group having gone on tour in Europe earlier this year, the show's MC, Lee Hwi Jae, asked the two about the difference between their fans in Korea and Europe."The European fans throw their underwear on stage. We even got hit by them before," Niel revealed.The answer came as a surprise to the MC who asked if they took any of the underwear. They laughed as they imagined what would have happened in someone's underwear had got caught on their ear while on stage.K.Will was also a guest on this episode of "Challenge 1000 Songs". MC Jang Yoon Jung asked the singer what he would do in that situation."It depends on the situation. This may change, but I would pick it up and ask 'Whose is this?' " he responded.