by the way
by the bye
incidentally
apropos

She did in the old woman too, by the way.

By the way, I found all but one of the eyes.

By the way, what became of the other young man?

And by the way, whatever happened to room service in your country?

How do you come to be out alone, by the way?

By the way I've got them on my car the work.

By the way, what do you think of the news today?

And by the way, perhaps only a couple more questions?

By the way, I think you have done great work.

You can't always tell by the way people seem from the outside.