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.
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 1983's 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 certify video games, Dell PCs, Tivos, and other home theater equipment as well.
Medium to high 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 the 45-second variant of the Eclipse logo. The suspensefully long Deep Note will haunt many people.