He 'walks a/the razor edge' [='walks a/the fine line'] between humor and bad taste in his comedy.
It was a 'razor-thin' victory. [=a victory that was won by a very small margin or amount]
He's a thrill-seeker who likes living 'on the razor's edge'.
(..) Step out of the vehicle, Don't look anywhere else, Look at me, - I am gettin' out, - Oww! - Spread your legs, - You got any razor blades? Lock your fingers behind your head, ma'am, Spread your legs, If I find anything sharp and I get cut, I'm gonna be real pissed off, (..)1994 The Glass Shield