This live performance takes an ugly turn when a floor panel gives way and So-hyun trips and has to grab a hold of Ji-hyun to avoid falling to the ground (at 1:23).
4Minute - I My Me Mine Live@Inkigayo 20100808
40MB 3:22 H.264/AVC 480×272 PSP Ready
Credit: source vid. shisch@jpopsuki
The girls are extremely professional though and continues with the performance, which was being broadcasted live.
Luckily no one was injured.