premise: A man with a red sweatshirt tied around his waist is standing in front of a table selling pop. hypothesis: girl sucks thumb in bed.
contradiction: These sentences have nothing to do with each other. There can be a man in front of a table and a girl sucking her thumb in bed. Unless the man is at a store and they are implying that the girl is also at the store in bed, it then makes the girl in bed implausible.