Adult Swim

Background
Adult Swim is a block of Cartoon Network started in 2001, beginning as a once-a-week block that would air adult animation, new and imported, for three hours each night. It got so popular, it expanded to be a daily block which covers all of 8 PM - 5 AM on CN, and is even considered a separate channel by Nielsen. It is overall most famous for giving cancelled shows like Family Guy, Futurama, Home Movies and Tuca and Bertie enough exposure to get picked up again (with new episodes of the latter two shows actually airing on AS itself).

Like Cartoon Network briefly did in the late 2000s, Adult Swim eventually started adding live-action, but this decision has been more warmly welcomed, due to the popularity of such resulting shows as Tim and Eric, its spinoff ''Check It Out! with Dr. Steve Brule and The Eric Andre Show'', and unlike its present network, live-action still airs to this day. This in turn led to the opening of a YouTube branch, which occasionally airs on the channel itself, which has made such (in)famous videos as On Cinema at the Cinema, Too Many Cooks, Unedited Footage of a Bear and Bushworld Adventures (a mock episode of their fan favorite show Rick and Morty).

Adult Swim almost never uses an actual closing logo (Williams Street unofficially serving as such, although not every AS original is from them), but there have been exceptions.

1st Logo (2016-)
Logo: On a black background, the Adult Swim logo forms by the words appearing one-by-one inside the already placed brackets.

FX/SFX: The words appearing.

Music/Sounds: The Mark VII Limited "Hammer" sound from 1951-1952, synchronized with the animation.

Availability: Current. Seen before the start of Adult Swim programming on Hulu.

Editor's Note: None.

2nd Logo (April 18, 2018)
Logo: Merely the Adult Swim logo against a black background.

FX/SFX: None.

Music/Sounds: A techno tune which fades out.

Availability: Only seen on the 2018 SDCC print of the Samurai Jack series finale "CI" after the Cartoon Network Studios, Williams Street and Cartoon Network logos.

Editor's Note: More effort could have been put into it, but as it was a one-off logo, it's understandable.