premise: A man with a determined look on his face holds a small wooden hammer while wearing a bib displaying a large red crab, another red crustacean held in his hand while another man sits and holds some food behind him. hypothesis: A man holds a chicken wing in one hand and a screwdriver in the other while looking alarmed.
contradiction: If a man holds a small wooden hammer in one hand and a red crustacean in the other hand, then his hand are full and he can't be holding a chicken wing and a screwdriver. A man with a determined look can't be described as being alarmed.