The sound it's used a lot on local celebrities tv shows, when someone talks about a secret of a famous actor or musician.
I think UglyBoy really understands me because i'm argentinan too, and i'm sure that he has watched tv shows like Indomables or Intrusos
In my opinion, the sound could used a lot when, for example, three or more people are chating and one brings a surprise into the conversation.
Anyway, I respect the opinion of the gods that develop and test Messenger Plus