บังเอิญ

He canceled the appointment abruptly. Coincidentally, I am free today.

Is he avoiding me, or perhaps we just didn't bump into each other by chance?

We accidentally made eye contact at just the right moment.

Coincidentally, we like the same coffee flavor, I guess.

By chance, fate guided us to meet again, I guess.

We accidentally met each other on another continent.

It happens that my friend moved to the continent of Europe as well.

That woman exclaimed when she accidentally saw a celebrity.

The relatives happen to be arguing about the family fund.

I accidentally met the Minister of Public Health.

If I had known this, I wouldn't have gone to the party. I accidentally met my ex-boyfriend's secret lover just like that!