In the classic Hey Arnold! episode (Season 2, Episode 11), Arnold and Gerald orchestrate an elaborate radio prank that spiraled into city-wide chaos. Inspired by Orson Welles’ 1938 War of the Worlds broadcast, their fake report of an alien invasion in Hillwood leads to mass panic when the local news accidentally broadcasts it as a legitimate emergency. Episode Overview

The boys' creative use of household items—like a sink and a blender—to create "otherworldly" spaceship noises.

As the townspeople prepare for a "war" against the invaders, Helga and the other kids happen to be trick-or-treating in silver alien costumes, making them the primary targets of the panicked mob.

Grandpa Phil’s "Halloween is serious business" speech and the boarding house residents’ commitment to scaring "the living daylights" out of people.

Tired of Grandpa Phil's dismissive attitude toward kids' pranks, Arnold and Gerald set up a "UFO Tonight" broadcast from the boarding house basement, complete with amateur sound effects.