In order to appreciate what heyjunsu@YT, a little pretext is necessary. The boys are actually very tired and thus, Yoochun was slurring as he spoke. This caused Junsu to burst with laughter, which then made Changmin laugh and when Yoochun managed to speak properly, the laughing had spread to Yunho and Jaejoong.
Luckily the host is very adaptable and eloquent so she managed to make it all look like it was planned.
No one can make this up. XP ENJOY.