The group arrives in Lavender Town and reaches the Pokémon Tower by dark. Misty and Brock, scared by the tower, want Ash to go in alone. Pikachu decides to take a quick nap; Ash follows suit and gets his sleeping bag, but Misty wakes them up by smacking a gong. Meanwhile, Team Rocket watches them through one of the tower’s windows. James runs off, but falls through a hole in the floor. Meowth then notices a closet door open nearby, revealing a Gastly, which scares him. Meowth points at Gastly, but it disappears before Jessie sees it. Gastly reappears over Jessie’s face, mimicking Jessie’s speech, and Meowth scratches Jessie. Jessie retaliates, angrily knocking Meowth into the hole with James. Jessie soon joins James and Meowth after looking at herself in a mirror and screaming at the sight of Gastly. Ash and his friends hear the screams from outside as Team Rocket falls through several floors. Team Rocket gets back up, but Gastly scares them again, knocking them out.
(Source: Bulbapedia)