There is a fine line between serendipity and stalking.

There's a fine line between patriotism and corn.

It's often a fine line what increase you can pass along because if you go up too much, we'll lose the job.

Life is that perfect fine line between ironies.

There's a fine line between genius and insanity. I have erased this line.

There is a fine line between something that's gratuitous, that's unnecessary.