My employer recently hired identical twins, which has caused a little confusion for some, not really a surprise.  I was aware of them since I saw them the first day they started to work here.  But a coworker didn’t know and approached me one day about the new girl and that he noticed she would change cloths during the day and thought she might be a bit vain.  He was very embarrassed when I pointed out that she was a twin and they both worked here.