13. Arnold's Halloween Apr 2026

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

His iconic and humorous reaction to the "invasion," which remains a fan-favorite scene. 13. Arnold's Halloween

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. Grandpa Phil’s "Halloween is serious business" speech and

The prank becomes too real when Doug Cain, a gullible local reporter, overhears the broadcast and reports it on the evening news. a gullible local reporter

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