A second object happened to fall in their field of view.

"How did you happen to fall into the hands of those people?"

"Tell me, how is it you happened to fall that day?"

A safe just happened to fall open when I was passing and the report dropped out.

And if something were to happen to fall into her pocket.

But I never had any luck; no such thing ever happened to fall in my way.

"We just happened to fall in love with it," she said.

She happened to fall in love with Chevy, but was never able to tell him.

A door may happen to fall shut, but this is not by chance.

"I guess it happened to fall on the right day," he said.