"Best in show" is the title that is given to a winning animal in an animal show/competition, such as a dog show, cat show, or horse show. There can be more than one "best in show" at any one show, because each show has multiple categories. The categories are usually differentiated by breed of animal, and each category will have one "best in show." It describes the very best example of a particular category or classification.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)