Search:

Either a freak accident like falling just right, or someone had the habit of dinging the spine on the sink to clear off the water. :shrug:

I once had a CD (ACDC) that fell out of my hands, and it...

You are a lucky man.
By the looks of the spine, that razor was already severely damaged.
It could have snapped at any time and caused a nasty accident.
Now your wife accidentally breaks it and...