This question truly made me LOL.
For most of my life, I have loved, nice, delicious, plump, sweet grapes.
Now, at seven months pregnant, there is something about sour fruits (including grapes) that grapples me. It is kind of funny.
Of course, I know what you are referring too, but it just made me laugh that this whole pregnancy, grapes that kind of hurt your teeth, make you pucker, and make you squirm a little have been... enjoyable.
I wonder what that says about me... eh.
For folks that have been there, or nearby, it means you're pregnant. My ex was slightly pregnant (~10 months in. Yeah, I know) and sent me to the store for a specific ice cream flavor.
When I got there, that flavor wasn't available, so I got something similar.
When I got home, within minutes I fled back to the safety of the store, where I sought and found the manager of the Fred Meyer's, who upon hearing my sad and desperate tale gave me a tub of ice cream of my choice.
The pity in his eyes was palpable.
Edit: I think I survived with the free ice cream by adding a jug of dill pickles to the order.
Hahaha. Never have craved pickles. But, plums dried in salt. Mmmmmm.