premise: A man in a pinstriped suit walks down the street and does n't notice the quirky poster on his left. hypothesis: The man is sleeping in his jail cell.
contradiction: One cannot be walking down the street and in a jail cell simultaneously.|contradiction: It is impossible that the man walks down the street and is sleeping in his jail cell at the same time.|contradiction: If the man is walking down the street, he is not sleeping in a jail cell.