I was even scared by the 1993 PBS Kids logo.
kidinbed:
Scary:
One word: Simitar. Scary animation, droning synth, it goes on and on. I got a blooper video @ Goodwill, thought it would be funny and BAM! Rainbow lines, crappy animation, and more droning synths, a fake choir, and to top it all off, creepy whooshes and a very jarring transition from an FBI warning that was scary enough in the first place!
Annoying:
The incredible world of DiC logo. Damn kiddified logo makes DiC look more kiddy.
Anything with moog synth or weird music. Walt Disney Classics, for one, and the other Elektra logo too.
And the first New Line Cinema logo? No music+weird font+incessant flashing=really annoying.
Used to scare me:
The Columbia TriStar "TAKE HOLLYWOOD HOOOOME!!!" chorus logo. That sudden loudness scared the crap outta me when I was 3.
Oh, I gotta add the Touchstone Snake (1986-2002). That logo gave me very vivid nightmares of blue snakes, thunder, etc. And that hellish tune stuck in my head and constantly replayed, causing more bad dreams.
AsdfTheRevival:
ScaryNONE!
Annoying
The 2002-present DiC logo, the 2004-present NBC Universal logo, and the 2003-present WB Television logo and the Klasky-Csupo SSF
Used to Scare me
The Bedford Falls Company logo as seen on shows like "My So Called Life" with the haunted house and creepy voices used to scare the crap out of me, but now that I've seen it tens of thousands of times, it's not creepy anymore. However, I warn you, this will scare the crap out of you the first time you see it on Youtube- especially if your volume was high (which mine was when I first saw it) MachineryNoise and Mikintosh3001 currently have it. Mikintosh's version is in high sound and video quality making it less scary, however.
Klasky Csupo "SSF", for the same reasons stated by WillWill45
WillWill45
Scarey:Klasky Csupo's SSF (formly nicknamed Robot), which is like what Asdf mentioned. Well, who wants a freaky face appering out of nowhere and staring at you like if you were crazy? The SSF is much like that. That stopped me from waching Nickelodeon, and avoding me from wach Rugrats movies! However, I love the their past logo, "Graffti". Constrtain Films also scares me, but not as much as the SSF.
Annoying:The first Saban logo.
Because of the music.
Silversword55:
Scares me:
HBO Independent Productions :
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
UGLYYYYYYYYYYY! Is that logo supposed to be an oven, which is getting ready to kill me? Oh and don't forget the bzzzzzzzzzzz bzzzzzzzzzzzz sound effect when the hand turns on the light. I refuse to watch Martin, and Everybody Loves Raymond, because of this logo.
Annoys me:
Columbia Tri-Star Television (1996-2002)
bigrene2
Scares Me: Annoys Me:
Thorn-EMI/HBO Video,
It's Because of that damn music!
sega3dmm:
Scares me:
Now, who doesn't know about THX and it's audio mark? I bet no one here doesn't know. It is the perfect formula for a scary logo/trailer, LOUD, SUSPENSFUL AND EAR-RINGING. Now, come on, alot people on CLG don't find synth sounds on a black background that calming. Exactly! Broadway is the worst trailer. Imagine you're in this mysterious theater, and you suddenly hear a soft decending sound. It scares you a bit because noting's on the screen and you are starting to think there's a problem 'cause the theater is old. While you're on this thought, a blue rectangular outline appears on-screen. It's in a creepy shade of blue and the film is old, just to make it worse. You then see "The Audience is Listening" appear and disappear. During that, this soft decending sound becomes a loud, hard, Stephen King-like acesnding noise and you feel the theater shaking. Then the THX logo appears, and the sound holds on a pitch, taunting you and making you deaf. This hold is very long until the THX logo fades out. Also, the logo shines like how people put their finger and slide it across their necks.
Used to scare me:
What used to scare me was the Walt Disney Classics logos from 1988-1994. I didn't care if the audio is clean or distorted. The animation scared me - so did the animation of the 1986 WDHV logo! Distorted music made it worse. I even had to REFUSE watching my Disney classics on VHS!
I was also scared of the 1993 PBS Kids ident called "The P-Pals". It wasn't scared of the Hip-Hop music and the "This is PEE BEE EZ! Hooh! Arf!" which I thought was awesome. I was afraid of the seizure-textured P-Pals and that dog. Does that dog even look like a dog or a pile of living s**t!? Iremember I used to shield my eyes with a pillow or something when it comes on. When the P-Pals were banned and were replaced by 2 kids named Dash and Dot, I was happy, but I remember the day I first saw it on TV. When I expected the P-Pals to come on-screen, I covered my eyes (with a pillow) but I heard different music and I took I little peek. I shouted in my mind that the P-Pals were dead - and I remember this and I was 4 years old!
Annoys Me:Media Blasters/Anime Works
It's because of that synth! It's on my Invader Zim DVD!
I'm also annoyed by the plaster-happy Incredible World of DiC logo because it plasters every single g**damn pre-2001 DiC show and I have a HIGH feeling that it's on those SatAM, AoSth and Captin N box sets for every SINGLE episode.
The thrid logo, or should I say logos, that annoys me is the Nickelodeon logos that plasters every Nicktoon logo if the split-screen credits were used. What puts the icing on the poisend cake is the kids laughing on those logos. I prefer those drum sounds in the 2000-2006 logo in it's very early days
Unknown:
This is a real annoyance: 
It's not scary, per se, but it sure is monotonous. And annoying. And plaster-happy.
Juniorfan88 (JRmotorsportsfan88)Scares Me Currently:MTE (1987-1990)