Promos typically run from 15 to 60 seconds, with 30-second spots being the most common, although some occasionally last run as little as five seconds or as long as 90 seconds. Most promos show select video or audio clips of scenes or segments from an upcoming program (such as a television or radio series, film or special). Some television promos (particularly for an upcoming television series) utilize a monologue format in which a star or host of the program breaks the fourth wall, which is often done in a humorous and/or parodical manner. Most radio promos utilize this format as well, with a host of the program discussing the show itself, though some feature audio clips from past editions of the radio broadcast. Broadcast television stations promote upcoming newscasts by featuring teases of select story packages to be featured in the broadcast, such as an investigative report or a special-interest feature segment.