I asked my wife about it:
Me: Have you seen a big, red reference book anywhere?Sure enough, there it was. It turns out that the student who watches our kids after school had been tidying up and "recipes" was the only word she recognized in the title so she put it with the cookbooks.
Her: No. What's the name of it?
Me: Numerical Recipes in C.
Her: Have you looked in the cupboard where we keep the cookbooks?
What impressed me most, though, was the fact that my wife immediately knew where it was when I told her the title.