Anchor: Some o' 'em have their heads screwed on straight an' know what they's doin' or tryin' t' do.
Entailed: Some of them know what they are doing or are attempting to do. 
Contradiction: None of them have any idea what is going on. 
Contradiction: Susie was cleaning her car.
Contradiction: An audience watching a perfomer.
Contradiction: A man is sitting at a table eating dinner.
Contradiction: I think my girlfriend has a number of good qualities.