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.