He did only one foolish thing in his whole life.

She sat with him for a few minutes, talking of little foolish things.

I've done a lot of foolish things and so has she.

Does he talk just to hear himself say foolish things?

That was a foolish thing to do, he told himself.

"I think it would indeed be a foolish thing if you were the man."

"Why did you do such a foolish thing as to come back?"

A foolish thing when there is so much to do.

Far be it from me to do any such foolish thing.

There has to come a time when those foolish things have to stop.