Frequently, although not always, the two heroes are of different ethnicity or cultures. However, regardless of ethnicity, the central difference is normally that one is "wilder" than the other: a hot-tempered iconoclast is paired with a more even-tempered partner. Often the "wilder" partner is the younger of the two, with the even-tempered partner having more patience and experience. These films sometimes also contain a variation on the good cop/bad cop motif, in which one partner is kinder and law-abiding, while the other is a streetwise, "old school" police officer who tends to break (or at least bend) the rules. Another frequent plot device of this genre is placing one of the partners in an unfamiliar setting (like a different city or foreign country) or role (like requiring police field work of a non-cop, rookie, or office-bound "desk jockey"). In these cases, they are usually guided by the other partner.
In his review of Rush Hour, Roger Ebert coined the term "Wunza Movie" to describe this subgenre, a pun on the phrase "One's a..." that could be used to describe the contrasts between the two characters in a typical film.
