What are some great examples of coincidence?

This by far has been "the" coincidence in my life.

A year back I was using a number whose provider was Vodafone. For some reasons, I stopped using it for almost a year and it was transferred to some other guy.

And my bank documents had that number. To change the number I needed my username and password, and I had conveniently forgotten my password.

To reset the password, i would get an OTP on my registered number which obviously wasn't with me. Else, I had to visit the branch for which I was lazy.

So I thought I'll call up on my old number and check if he could help me with my otp.

Now the coincidence. Here is the conversation we had
Me- Hi, this is Chitra here. The ex-owner of your number.
Him- are you serious? You are calling me from my old number.
.
.
.
.

So he had picked my old number as his new one and I had his old number.

Edit- No, it didn't become some love story. He just helped me with the otp thing and we bid goodbye.
 How I got to know he is married? There were kids shouting non stop and he apologized on behalf of his son. It's no love story, no movie.

Chitra Iyangar
Source - Quora