Enthymeme - a logical argument that contains a conclusion but an implied premise. This type of reasoning is informal-in that the conclusion is reached based on implied reasoning rather than stated reasoning. Chiasmus is a form of enthymeme.
1. We cannot trust Katie, because she lied last week.
2. I cannot believe Sam broke your vase. I have known him for years!
3. I failed the test because the teacher doesn't like me.
4. Of course, he got the job - he's a man!
5. "With a name like Smucker's, it has to be good." Smucker's Jelly commercial
6. "He would not take the crown. Therefore 'tis certain he was not ambitious." Shakespeare, Julius Caesar
7."Senator, I served with Jack Kennedy. I knew Jack Kennedy. Jack Kennedy was a friend of mine. Senator, you're no Jack Kennedy." Lloyd Bentsen