Anchor: Observational humor, that's what we trade in here.
Entailed: We share observational humor here.
Contradiction: Observational humor will not be tolerated here.
Contradiction: Two men racing on a track.
Contradiction: A girl is happy because of the flowers.
Contradiction: The academic pecking order, and all that it involves, is vital for a scientific attitude. 
Contradiction: They have been going over the proposals.