premise: A couple sitting at a reception table, the man is laughing as he motions back and the woman is laughing motioning forward. hypothesis: The man is laughing with the woman.
entailment: A couple generally refers to two people who are emotionally connect and may or may not be of the opposite sex. The man who is laughing as he motions back and the woman laughing as she is motioning forward  may not be laughing together as the word with indicates.