Aidan: "I see a boat."
Eric: "Yeah, I think that's a fishing boat. Or a whale-watching boat."
Aidan: "A whale-watching boat? Those kill whales!"
Eric: "Oh, I don't think so. They just watch them. It's whaling boats that kill them."
Aidan: "No, whale-watching boats kill whales!"
Evan: "No they don't, they just watch them. And you can't kill a whale by watching it. Unless you have laser vision."