The Future Holds Promise

(I am with my recently-engaged sister at a jewelry store with her fiancé. They keep getting into a disagreement, as he keeps steering her towards smaller and smaller diamonds.)

My Sister’s Fiancé: “Look, what’s wrong with these rings?”

My Sister: “Those are ‘promise’ rings, like what a high school kid would give.”

My Sister’s Fiancé: “Well, I PROMISE to get you a bigger ring later…”