Joe and the art of the sale

Joe Cosgriff is not for sale. Or he doesn't sell things. Or something like that.
When my kids were young we traipsed down the street and visited Grandma Cosgriff and Grandpa Joe quite often, usually once a week. Grandma would often begin such visits with a small list of things available to us: cookies, coffee, candy and the like. Grandpa Joe would quickly stop her with an abrupt, "Don't sell them on it! They know they can have what they want." Grandma would purse her lips in mild anger, and that would be that. We'd get cups of coffee or cookies and go on about a conversation.
But interestingly, if by some chance Grandma was not nearby, Grandpa Joe would launch into a litany: there's coffee on the stove, and cookies in the jar, and cake on the table (plates on the shelf, forks in the drawer) and so on. Then he would realize what he was doing and add, "But I'm NOT selling you on it. I'm only telling you it's there if you want it."
It was merely a variation on a theme. But it may have been my first experience with what the politicians would call 'spin'. Grandpa Joe could certainly put his spin on things.