Hah, I had this happen when doing some work in Rome. The CEO of the startup remarked that I had a heavy American accent, which... I was a bit taken aback by, because I rarely hear that, and I work hard to speak Italian well. Later, he heard me speaking with another guy at the company who was from near where I lived in Padova, and it dawned on him (I don't think he was the sharpest tool in the shed) that my accent was more 'Veneto' than American.