Stranger asks: Stranger has never asked and if they did I would ignore them like I don't know what they are talking about.
Wife asks: Either: "Duh." or "nope. They sell beer here and I'm having four."
Friends ask (who also do): We just say to each other, "You?" and answer, "Yep. You?" It's a courtesy when we go to each other's houses. If we are going to drink beers watching the game they go in the person's house safe. Every time.