Made even more terrifying by the fact that Doom was so serious and sane compared to the rest of the cast for most of the film, until his reveal as a Toon, suddenly smiling and not the good kind. And those Cartoonish eyes, oh God, thoseeyes that can't even stay in one design for an entire scene. And that insanely high pitched voice. No wonder he's not in the ride!
The worst part is, normal toons always cause Amusing Injuries because they don't try to harm anyone and are in it for the laughs; Judge Doom, on the other hand, can and does harm people using Toon Physics. It's a good thing Eddie dodged that buzzsaw when he did.
And he did all this by only revealing his eyes, hands and voice. Don't even begin to imagine what the rest of him looked like under that Latex Perfection mask. Good thing he got dipped before he could show that ...
The graphic novel sequel, Roger Rabbit: The Resurrection of Doom offers this◊ as Doom's true Toon form, complete with a Slasher Smile just to ensure sleep-deprivation.
Originally in What Could Have Been: He was going to have even much scarier features like his real Toon mouth and RED HANDS WITH LONG NAILS, and was going to have more lines like the above and he was going to played by Christopher Lee.
Tim Curry was turned down from playing Judge Doom because he was so scary in his audition that Zemeckis, Steven Spielberg and Kathleen Kennedy were all scared out of their minds of him, and considering how he played Pennywise, it's better if he didn't.
Speaking of Judge Doom, let's talk about the substance he creates, known as the dip. Any toon that comes in contact dies instantly, in fact, they are permanently erased. And to think he actually planned on flooding Toontown with it...not a pleasant thought, is it?
Even worse is the fact that Toontown is home to all toons, no matter the animation studio. If Judge Doom had succeeded, Snow White, Mickey, Bugs Bunny, Daffy Duck, Donald Duck, and every other cartoon character kids love would be dead forever. Your childhood and that of everyone else would've literally dissolved.
Many scenes in Toontown.
The sequence where Eddie Valiant meets Tweety Bird, Bugs Bunny, and Mickey Mouse (while falling from a skyscraper. They're less than helpful).
Though Mickey felt sorry for Eddie. And Bugs did warn Eddie he wouldn't want the "spare".
Then screaming as he melts from his own Dip after revealing he's a Toon. Of course, considering how much of a horrid monster Judge Doom really is (Such as killing an innocent cartoon shoe earlier), he pretty much deserves it.
Roger's reactions to shots of strong alcohol (rocketing into the air while shrieking like a steam whistle, shattering everything breakable in Maroon's office/the bar).
Eddie driving into Toon Town a land of eternal sunshine and everything is alive and happy and singing. Being a real person in a land of cartoons is just creepy.
The opening cartoon. It played out exactly like a slapstick cartoon from the Golden Age... except that it was highlighted with horrifying, tense music and dramatic, dizzying camera angles. The whole thing was just nerve-wracking.
When Wheezy is dying, his angelic soul floats out of him. Coughing, he desperately reaches out for it, but it flies away and he dies.
Anyone else find Roger chewing out Eddie over whether or not to find a new girl after seeing the Patty Cake pictures, kind of creepy?
R.K. Maroon: Roger, I know this seems pretty painful now, but you'll find someone new. Won't he, Mr. Valiant?
Eddie Valiant: Good looking guy like that? Dames will be breaking his doors down.
Roger Rabbit: Dames? What dames?!
[Angrily grabbing Eddie by the lapels]
Roger Rabbit: Jessica's the only one for me! You'll see! We'll rise above this piddling peccadillo! We're gonna be happy again! You got that?! HAPPY! CAPITAL H-A-P-P-I!!!
More likely, its that the souls is the sign of a "funny death" like in a cartoon, while the Dip is the sign of a serious, painful death which isnt meant to be funny, and thus no cartoony souls with harps and wings.