Who is Bob?
And what does he know?
“As you know, Bob” moments occur when a writer uses dialogue between characters to slip in backstory that the readers need to know, of which the characters are already aware.
Example: “As you know, Bob, it hasn’t rained in seventy-nine days. We’re in a drought.”
Why is this a no-no?
Well, it’s clumsy. Dialogue should be sharp and serve to move a scene forward. It should also reflect the way people speak to one another. How many times have you actually said, “As you know . . .”
If it’s such a big no-no, why do we writers do it?
Because we’ve been told ad nauseum to “show, don’t tell.” Dialogue can be a great way to “show” readers what’s going on in a scene, either by what’s said or by the subtext of what is left unsaid. And if one character is revealing important information to another character, which has been unknown up to this point, that can be a dynamic moment.
But if it’s just rehashing info to keep readers in the loop, it falls flat.
So what do I do instead?
This is a perfect time when “telling” is the best choice. Use a short bit of narrative to relay the information needed.
Example: After seventy-nine days of no rain, the drought conditions were hardening more than the soil. The townspeople’s hearts were hardening, too.