Most popular tune everywhere...

Jason Mraz's "I'm Yours" [Here in Korea!]. We heard this song in nearly every country (in English). It was hilarious.

We also saw the movie poster for them Pixar flick "UP" in nearly every country. It was funny to see the poster with the same image (see below) in different languages (Hebrew, French, Korean, Chinese, Thai, Aussie English). It was clearly THE flick of the summer.