No, I knew about the sour grapes story, and that WASN'T low hanging fruit, which is part of the point of that story. That's not what I was thinking of. I pulled out the book for a quick skim through but didn't find what I was looking for. Aesop's Fables is compiled from a bunch of ancient fragments (from the time of Sappho, they come from next island over from Lesbos), these stories are much older than the christian bible, and they serve as the culture very well.

One robin does not a spring make.
You're judged by the company you keep.
Dog in the manger.
Sour grapes.

Etc.
link (history of Aesop is at the bottom of the page)

SRS