I downloaded this video by Super Junior because I had seen Girls’ Generation perform a short version of the song at Music Core.
Girls’ Generation are, from what I’ve read, supposed to be the female counterpart of Super Junior.
Of course, I can’t mention Girls’ Generation’s performance without posting that video too
Girls’ Generation ~ Sorry, Sorry Live@Music Core 20090808
6MB 0:57 H.264/AVC 480×272 PSP Ready
Credit: source videos from DannyLovesMusik@jpopsuki & yoobin.skyrock.com