Anchor: No way he'd be with her if this wasn't an instructional sex video!
Entailed: He would not be with her if this video was not about sex instruction.  
Contradiction: He would be with her no matter what this video was about.  
Contradiction: The little girl plays the harmonica fluently.
Contradiction: A man is shopping for produce.
Contradiction: It's not like that at all. 
Contradiction: When they had it, they'd spend it on things such as new books.