The salesman proffered a small stuffed animal.
"Whatever you do," he said, "don't get it wet, and don't feed it after midnight."
"Why?" I asked, with a derisive snort. "Will it turn into some sort of demonic monster?"
"No, you dolt, it's a stuffed toy. If you get it wet the fabric will shrink, and it's inanimate, so it can't eat."