I'm an identical twin and live in a different part of the country to my twin sister.
On several occasions at work (in different departments) a person has called me my twins name, apologised then called me my correct name. They don't know my sister and they're not close colleagues. I have never mentioned my sisters name. This has happened maybe 4 or 5 times. Any other twins out there that this has happened to before? I find it all a bit spooky.