Is there a term or word appropriate to describe the trick of using a general term and then explicitly adding a specific term to strongly imply that the specific is not part of the general? The trick I see never uses a negation or a word like "except." It simply "adds" something at the end as a slight or insult to the thing being added:
My classes are filled with really smart people. And John.
Before you are the best and most clever and most attractive and Susan.
Best Answer
TV Tropes call it "My Friends And Zoidberg" trope:
http://tvtropes.org/pmwiki/pmwiki.php/Main/MyFriendsAndZoidberg