“And there's a thin line between genius and insanity, isn't there?”
“There's a fine mascara line between genius and insanity”
“There's a fine line between genius and insanity. I have erased this line.”
“At times there's a razor-thin line between truth and insanity.”
“There's a fine line between genius and insanity--and I enjoy trampling all over it.”
“There is a fine line between insanity and genius.”