“This isn't working.”

“If it is stupid but it works, it isn't stupid.
(a Shin'a'in saying)”

“It isn't enough to talk about peace. One must believe in it. And it isn't enough to believe in it. One must work at it.”

“Anyone can do any amount of work provided it isn't the work he is supposed to be doing at the moment.”

“If that isn't typical male stupidity! If something doesn't work, kick it or swear at it!”

“If what you've done is stupid, but it works.. then it really isn't all that stupid.”

“I hope they change my drugs soon. Whatever I'm on isn't working.”

“Unfortunately Sting's jazz work isn't nearly as inventive as his rock songs.”

“… and yet isn't it always the inappropriate thing, the thing that doesn't quite work, that's oddly the dearest?”

“Mr. McGregor's a nasty piece of work, isn't he? Quite the Darth Vader of children's literature.”