Batman: The Brave and the Bold/Nightmare Fuel

"Fun Haus: Gee, that won't give kids nightmares, will it?"
 * Commented on in "Invasion of the Secret Santas!", when Batman hurls an exploding Batarang at an evil robot Santa, which catches fire and burns down to a metal skeleton-- while continuing to march at him and ho-ho-ho:


 * "Shadow of the Bat!" seems calculated to give the audience a good scare. Vampire Batman is ruthless and savage (he even takes out Alfred), and the sound of him chomping down on people is remarkably unpleasant.
 * "Emperor Joker!": How many of you expected to see ?
 * The Faceless Hunter, from Batman the Brave And The Bold. Holy hell, this thing is a monster. He roams the universe, finding worlds that his master, Starro can conquer, by attaching horrible mind-control probes to their faces. He's a physical god, can teleport, turn invisible, and has a terrifying arsenal of traps and weapons. He spends most of the series tracking, defeating and mind-raping the various DC heroes. And if you can't be posessed by a Starro spore? He'll horribly kill you. It get's worse though. How and why did he become Starro's herald? . It's pretty bad when a world-conqueror makes you look good by comparison. And the creepiest John Di Maggio voice imagineable doesn't help matters.