Related ancestors

1) I have been researching my family tree and realised a name which came up on my tree was the maiden name of someone in my department at work (we had been discussing maiden names one day). I thought no more about it but then, out of curiosity, asked my friend if any of her family came from Somerset and she, after confirming with an uncle, was able to say that yes, they did. After a bit of research, it turned out that my 5 times great aunt by marriage and her 4 times great aunt by marriage were sisters!! This was more surprising as neither of us were brought up anywhere near Somerset. 2) On 3 separate occasions while living in London, I have met different friends from my school in Northern Ireland. On one occasion,one friend was in the same shop as me and the other two occasions were on tube trains. I couldn't get over the coincidences of being on those trains, on those carriages and at the same times as my friends. 3) On a number of occasions, my sister, mum and I would all find we had bought the same blouses to wear at Christmas - bought separately from each other!