The funniest thing that was ever said to me regarding my accent was when I was in New York a few years back. We got talking to some guys and girls from the UK. Out of nowhere one of them says "I can see now where the Irish twang on some of the New York accents comes from" I can't see it myself at all !!
The strangest thing that was every said to me was when I was in Macy's in San Francisco years ago. This perfume lady stopped us and we were chatting away to her and she said "Where are you guys from" and we said "Ireland" then she asked "Idaho?" and we said no "Ireland, in Europe" and she "Oh wow, your English is so good"
I hadn't the heart to tell her it was our first language so I would hope so. I'm still not sure where she really thought we were from !