Since it's inception, due to airing on the same channel space as Cartoon Network, Adult Swim opens with a Bump displaying a content warning regarding the nature of it's shows. The warning begins with an image of the Parental Advisory logo, as seen on the labels of CDs and Cassette Tapes to alert parents that the music may not be suitable for young audiences. The intention is the same here, except "Explicit Lyrics" is replaced with "Mature Content".
The bump then changes to a more specifically written message advising parents that the content may not be suitable for children under a specific age, which has changed over the years from fourteen to seventeen, to currently not stating a specific age.
Unlike other bumps, no music is played over these.