Performance choreographed by a band, choir, or dance group to be done in a public setting with no prior warning to the bystanders. The goal is to get in, perform, and get out anonymously. Usually filmed and posted to the internet via You Tube.

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)