Looking on the internet deeply has found these results:

It can be a coincidence is the most popular phrase on the web.

It can't be a coincidence 1350,000 results on the web	It can be a coincidence 1383,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It can't be a coincidence that the beast who killed Rebecca and Alistair is back in our lives, can it? And it can't be a coincidence she died the day after receiving that video. Mnh It can't be a coincidence that the reporter wrote down the name "Pleiades". It can't be a coincidence that Jake keeps landing on a triangle. mnh. And it can't be a coincidence that you were jumped the same day you were questioned about a homicide. Well, it can't be a coincidence that on the same day Hixton's car was taken, he was killed. She knows about vampire stuff, and it can't be a coincidence.	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

It can't be a coincidence

1350,000 results on the web

It can be a coincidence

1383,000 results on the web

More popular!

It can't be a coincidence that the beast who killed Rebecca and Alistair is back in our lives, can it?
And it can't be a coincidence she died the day after receiving that video. Mnh
It can't be a coincidence that the reporter wrote down the name "Pleiades".
It can't be a coincidence that Jake keeps landing on a triangle.
mnh.
And it can't be a coincidence that you were jumped the same day you were questioned about a homicide.
Well, it can't be a coincidence that on the same day Hixton's car was taken, he was killed.
She knows about vampire stuff, and it can't be a coincidence.

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.