Alternative words for razor sharp?

I'm still laughing at the thought of an irresponsibly sharp knife lol

My father in law says things like that every time something bad happens to him and he blames objects or people so I read that in his voice lol
 
"sharp enough to circumcise a gnat"

Jesus....now that's sharp!!! LOL

That one comes courtesy of John candy in uncle buck, when he pulls the hatchet out of his trunk and says " I've been known to circumcise a gnat "
 
Scary Sharp, Hair splitting sharp
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