THX

Logo
On a black background, we see a blue outline of a rectangle. The gray text "The Audience is Listening" fades inside the outline, then fades out. A few seconds later, the THX logo in silver appears, The blue rectangle outline fades out, and "LUCASFILM LTD. SOUND SYSTEM" appears and the THX logo shines. Then it fades out. This second trailer in 1984 is called "Broadway". There is a new THX trailer in 2015 named "Eclipse". We start off in a shooting starfield. Then, a large black eclipse fades in, glows and spins. Then, many shiny white/black sticks and veins appear all over the eclipse, representing the iris of the human eye, and we zoom further into it as the sticks and veins move around and form in different ways. Suddenly, a large "O" appears in the middle, akin to the current logo for Orion Pictures, and we zoom through it, revealing the THX logo, which is black and has dark shines on it. The text "see you on the other side" wipes in underneath the THX logo.

Info
THX is a motion picture quality certification system (despite being branded as a "sound system" until 1997) founded by Tomlinson Holman and George Lucas in 1982 (in turn was then-owned by Lucasfilm Ltd. until 2002, when spun-off in its present day company, THX Ltd. It's now owned by Creative Labs), named after the first film Lucas directed, THX 1138. The THX system was created for the theatrical release of "Star Wars: Episode VI - Return of the Jedi". And later appeared on the VHS release of most 20th Century Fox movies and the earliest DVD releases later on in 2002. THX officially stands for "Tomlinson Holman's EXperiment". THX has provided certified VHS, DVD, LaserDisc, and Blu-ray (and HD-DVD; Brave Story only) films from major studios such as Buena Vista/Walt Disney Pictures and 20th Century Fox, among other studios, also when this was seen in theaters. They also certify video games, Dell PCs, Tivos, and other home theater equipment as well. Additionally, the THX logo is also referred to as "the loudest noise of your childhood". And it was, for young Disney movie fans.

Editor’s Note
This trailer's rendition of the Deep Note, cited as "the most awesome, powerful, and terrifying audio trademark in the film industry" by No Film School, is frequently referenced and parodied for its capability to be perceived as loud and menacing. This is an aural illusion; the spectrum of frequencies used in the sound, which Gary Rydstrom says makes it "just feel loud", are of sufficient volume for theaters.
 * No Film School, May 2018, updated in October 2018
 * Fast Company, March 2014

This is one of two logos that used a theme other than the original Deep Note, the other being "Grand" (the 4th logo). It proved to be unpopular among viewers. Andy Moorer, in an interview with Twenty Thousand Hertz, recalled that "Nobody liked [the sounds], nobody remembered them".
 * Twenty Thousand Hertz, June 2018

The Eclipse logo gained notably for the much louder deep note, and thus is sometimes thought to be the scariest THX trailer of them all due to this (specially the Warren Cinemas variant).

FX/SFX: The zooming in of the eclipse, done by independent Norwegian design studio Two-Shots Production (now Vortex Film). Extraordinary CGI.

Scare Factor
None. This is an extremely cool logo, though the scare factor may increase for the people who are scaredy-cats.