I used to get it a lot after I came back from being in the US, I had picked up a little of the accent but I also spent a lot of time with a girl from another country so picked up some of that too.
I think for about 2 years after I got home I was always being asked where I am from or if I am here on a work visa
I was asked if I was Greek 'or something' when I had spent some time in a sunny place and come home tanned.