Anchor: A possible future president roughs you up and you don't remember it?
Entailed: You don't remember being beaten by a man who might become president?
Contradiction: A possible future president asks you to marry him and you remember it vividly.
Contradiction: A man in a purple shirt is fishing.
Contradiction: They succumb in order to get the better treatment. 
Contradiction: The machine my friend was working on brought me to my knees.
Contradiction: Bike riders are at an athletic event.