Valentine’s chip on shoulder: how idioms originate

Grumpy?

As it’s Valentine’s Day, I was remembering one of the less romantic dates of my early dating life.

I think it was the second date and Charles had asked to “see my etchings”.

The unromantic prelude to this great event was the sharing of a plate of chips. Two remained on the plate, and I said to Charles, “You can have them, one for each shoulder,” smiling at my own wit.