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'.
(..) No! No. No, it's not. This is real. How is it real? Wait, which? The chicken. And the... The chicken. There's a triple razor wire fence around this camp. It's impossible. And if you think that chickens can fly, well, we better go to Wikipedia right away. Oh, my God, you have the Internet. (..)2013 TvShow: Orange Is the New Black Title: The Chickening Season: 1 Episode 5