context: A newspaper delivery man smiles as he walks down a sidewalk holding his papers on top of his head.
hypothesis: It is probably not the case that the guy just got a big tip from a customer.
valid_hypothesis: It is probably not the case that the guy just got a big tip from a customer.
invalid_hypothesis: We believe that the guy just got a big tip from a customer.
hypothesis_assertion: The guy just got a big tip from a customer.