1.18. A man is sitting in a room. Another person enters, carrying a closed cardboard box, and sits down nearby. Though the first man can't see, hear, or smell the box's contents, he knows what's in the box. (ES original)

1.18 answer: The man is allergic to cats, and feels the allergy symptoms coming on, so he knows the box contains a cat. (It could be argued that he must be able to smell the cat, but I'd say that "smell" implies consciously noticing a smell, and is not the same as reacting to unnoticed dander.)