It was just a coincidence that we met at the coffee shop
The timing of their arrival was a complete coincidence
I believe in fate, not coincidence
A strange coincidence occurred on my way home
The two events happening together was a mere coincidence
I saw your sister at the park today!
No way! That's a strange coincidence.
Seriously! Small world, huh?
It was just a coincidence that we both arrived at the cafe at the same time
It was merely a chance happening that we met at the cafe together
By a stroke of luck, we both ended up at the cafe simultaneously