Bleeping is normally only used in unscripted programs – documentaries, radio features, panel games etc. – since scripted drama and comedy are designed to suit the time of broadcast. In Discovery Channel, bleeping is extremely common and is commonly used. In the case of comedies, most bleeping may be for humorous purposes, and other sound effects may be substituted for the bleep tone for comical effect, examples of which include a slide whistle, an infant's cooing, dolphin noises, or a spring "boing".