He said he'd put them at a friend's house for safe keeping, and the friend just happened to have gone away on holiday.

If friends of his happen to come to the park, he will challenge them to a contest, but that is about it.

Phil asked if my friend might happen to be of the female variety.

Thanks to Mildred and her friends, this does not happen.

Yes, friend, this sort of thing happens all the time.

Just happened to run into a few friends on the way back.

Those old friends happen to be small, made of felt, and operated by someone off camera.

A friend who saw him recently said he seemed "resilient, like nothing had happened."

I and my friends happened to be the first ones to help him when he discovered his loss.