They looked at him as if they were hiding some clever, subtle, private joke.
I sincerely hope that your appalling spelling and grammar is a subtle joke.
At times like this, Montana used to tell a subtle joke or light somebody's shoe on fire, but he was gone.
And one very subtle joke I never realised until just now.
Tesla had, to be sure, a sense of humor and enjoyed putting over a subtle joke.
As always, the dark woman seemed amused, as though she had caught the universe in the act of playing a subtle joke.
I went back, thinking that it was maybe one of Arnie's subtle little jokes.
It seemed to them to be a very subtle joke.
Meg was left with the supposition that he had made a subtle joke she hadn't understood.
It was all intended as a subtle joke.