Another One Bites the Dust
This completely unrelated Korean ad was on approximately every five seconds in 2006.
Every single student I had could sing the song.
(must. . . not. . . make. . . commentary)
I'm Still Standing
Sunkist Lemonade: a Korean ad that really sticks in your head.
Liberace, baby! (sweet mercy I wanted to post this one, but embedding was disabled)
Finally, the topper: these are members of the big-time Korean pop-bands Super Junior and Girls' Generation.
finally, in another completely unrelated link, Korea Beat, debunking a widespread (though not as widespread as before) myth some foreigners are told about Korea.