premise: A young man wearing goggles is putting some liquid in a beaker while a young girl wearing blue gloves looks down while holding a pen. hypothesis: A man is lighting a fire under the beaker as part of his demonstration to the girl.
contradiction: You usually cannot light a fire under a beaker while you are putting liquid in it.|contradiction: The man is putting some liquid in a beaker or lighting a fire under the beaker, not both.|contradiction: One does not look down during a demonstration.