Knowing a language perfectly with respect to grammar and pronunciation is no guarantee to blend in with the natives unnoticed. A language is not only pure means of communication, but also expresses the speaker's cultural background and mindset.
According to from which country your dialog partner comes from, he does not only want to get his message through, but also wants to communicate his personality. English as the world´s communication tool No. 1 soemtimes reminds me of the Babel Fish, respons