Girls' Generation's Sooyoung shared an interesting story about how she once got in a fight with Tiffany while eating a hamburger on the August 10 installment of KBS 2TV's 'Happy Together 3'!

Tiffany began, "We didn't have time to eat because of our busy tour schedule, appearing on various programs, and such. One time, Sooyoung was eating a hamburger and I asked for a bite. I had full makeup on at the time so I smeared lipstick on the burger. When she saw what I did, Sooyoung said, 'If you're gonna eat it, do you mind not putting lipstick all over it?'"

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Sooyoung defended herself, saying, "No, I only said, 'Oh, lipstick'. I tend to get very sensitive when it comes to food, and I think Tiffany might have been upset."

Sooyoung went on, "Taeyeon then offered a bite of her hamburger, as if she didn't care about getting lipstick on her food. So then it got a little awkward. It was about five years ago, but Tiffany still acts cautiously when we're eating. [She's] Afraid that she might make lipstick marks!"