The Most Fashionable Children's Party

Note that the answers are in the credits at the end of the video, except for 'T', for some reason.

and what about Leatherface?

How is D Dexter and not Dracula?

mikele_, S is Satan, and is a reference to The Exorcist

S -> SUSPIRIA (1977, dario Argento)

http://www.youtube.com/watch?v=RBhF__cBH8E

http://en.wikipedia.org/wiki/Suspiria

Complete List:

A-Alien
B-Beetlejuice
C-Chucky
D-Dexter
E-E.T.
F-Freddy Krueger
G-Godzilla
H-Hulk
I-Incubus
J-Jason Voorhees
K-King Kong
L-Lecter, Hannibal
M-Mummy
N-Nosferatu
O-Orca
P-Pinhead
Q-Queen of the Damned
R-Razorback
S-Satan
T-Terminator
U-Uruk-Hai
V-Vader
W-Werewolf
X-XTRO
Y-Yeti
Z-Zombie

X most closely fits the logo for Xtro-talk about obscure.

Good on you, Gnawfist!

I=Incubus (?)
R= Razorback

R = Razorback
the font fits for it as well. Not that well known

It's safe to say R is something else; The sound you hear is a pig (look at the bottom right to see a tiny silhouette of one moving too)

H is definitely Hulk.. is R Russians/Red Dawn.. the picture makes sense and so does the horse sounds.. but don't know where that font comes from

Lycanthrope, You are right indeed (how did I not see that :/) The bixby tv-show tune!

I - Invisible man
O - Octopus

i thought H was hulk. am i wrong?

Don't know 'I, M and R', and not sure about 'X', but for the rest I got:

Alien
Beetle Juice (Betelgeuse)
Chucky
Dexter
E.T.
Freddy Krueger
Godzilla (Gojira)
Halloween (Michael Myers)

Jason Voorhees
King Kong
Lecter, Hannibal
Mummy
Nosferatu

Pinhead
Queen Of The Damned

Satan
Terminator
Uruk-hai
Vader, Darth
Werewolf
X-traterrestrial
Yeti
Zombie