Brown Eyed Girls' Jea, danced to 2PM's "Heartbeat," in a surprisingly humorous fashion.� Prior to the dance off, she revealed to the cast of "Quiz to Change the World," that her Achilles tendon is slightly short.� She stated, "because my Achilles tendons are short, I have a hard time sitting in a squat.� Also, I can't dance well." Her comical adaptation of "Heart Beat," won the casts' laughter as she resembled a dancing scarecrow. http://www.youtube.com/watch?v=i7yND1N2kdI Source: daum