On a black background, we see a blue outline of a rectangle. The grey 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 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, a la the Orion Pictures logo, 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.
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. and is now owned by Creative Labs), named after the first film Lucas directed, THX 1138. The first THX film was the classic 1983 hit movie "Star Wars: Episode VI - Return of the Jedi". 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 phuking noise of your childhood". And it was, for young disney fans.
Medium to high for the Broadway variant, because of the dark atmosphere and the Deep Note. This has been known to cause "THXphobia", which is the fear of the THX logo or more specifically the Deep Note. But, this is nothing compared to the Eclipse trailer.
High to nightmare for the Eclipse variant, due to the reconstructed Deep Note and darkness, but much lower for those used to it and fans of it. The animation is wonderful and the Deep Note sounds even better than before.
Nightmare for 45 and 60-second variants of the Eclipse logo. The suspensefully long Deep Note will haunt many people.
None for the Tex Moo Can variant, the logo is considered hilarious by many people and THXphobics.
High to nightmare for the Broadway VHS and Laserdisc variants, the sudden appearance after being seen after FBI Warning Screen, Stay Tuned Bumper, Different Sound Logo or Feature Presentation ID, which gives you little to no time to turn down the speaker volume, the deep note is scarier. This variant is the most scariest version of the THX logo, because the Deep Note is high pitched and sounds scarier. This version will scare children the most, because this appears on lots of Disney VHS tapes and LaserDiscs, such as Lady and the Tramp.
Medium for the Shrek trailer, because of Shrek and Donkey being present, but it still scares some due to the Deep Note.
High to nightmare for the Cavalcade variant because of the sphere shattering and the Deep Note. Unsuspecting viewers may not realize that the deep note is coming, let alone it even being a THX intro, making it even worse...
Low to medium for the Cimarron variant, the zooming THX may scare a few people.
Medium for the Horton variant, the CRASH and Deep Note can startle some people, but it has Horton.
Medium for the Broadway DVD variant, it's starts quiet but the Deep Note is lower.
Medium to high for the Wings variant, it was first trailer.