COINCIDENCE?

I lost one of my favourite pencils today on my way to this seminar thing.
I think it dropped out from between the pages of my book. I was using it to write something in my diary 2 minutes before entering the lecture theatre.
And the girl sitting in front me just happened to have the exact same pencil.
I couldn't help but wonder if it was mine.
It certainly looked like it was mine. And also the sounds it made was exactly the same. (It is quite a distinctive pencil. I am not being weird).

In my head, there were two voices—
one that said, "It must be a coincidence".
then another voice that kept saying, "I think not".
"Coincidence?"
"I think not!"
"Coincidence?"
"I think not!"
"Coincidence?"
"I think not!"

I don't know ;(