E: "You shouldn't kill flies."
Me: "Why not?"
E: "Because they're God's creatures. You shouldn't kill any of God's creatures."
Me: "Where do you think hamburgers come from?"
E: "I don't know. Pigs?"
Me: "No, you know hamburgers come from cows. So, do you want to stop eating hamburgers?"
E: "No. But you're not the one killing the cows."
E: "So, you shouldn't kill flies; they're God's creatures."