The castle thunder is a running gag sound effect that is used throughout the original Hillenburg era episodes. It is first used in the popular 1932 film Frankenstein. It simply a loud thunderclap near a castle. This sound effect was used in some shows before and after the series was created. It is mostly used in some Hanna-Barbera, classic Disney movies, classic Nelvana cartoons, 70s, 80s, and 90s cartoons. There is also an alternate version, which was only used in The SpongeBob SquarePants Movie. It is similar to another running gag, "My Leg!"
List of episodes that contain the sound effect
- Note: There may be episodes that aren't listed that may have the sound effect. If you heard the sound effect in any unlisted episodes of the series, please add it to this list.
- Suds - When SpongeBob is dreaming about raining Krabby Patties.
- Neptune's Spatula - When King Neptune first shows up after SpongeBob removes the spatula from the Royal Grease.
- Scaredy Pants - Heard at the start of the episode, and again when the Flying Dutchman appears in the Krusty Krab.
- Arrgh! - Heard as Spongebob and Patrick are cowering in fear at the Flying Dutchman, and once more as the Dutchman disappears.
- Something Smells - When Patrick is entering SpongeBob's house.
- Your Shoe's Untied - Heard a few times during the scenes of the Flying Dutchman with Spongebob, most notably when he laughs at Spongebob's request to show him how to tie a shoe, and right before disappearing.
- Shanghaied - The Flying Dutchman introduces himself to Squidward.
- SpongeGuard on Duty - After SpongeBob says that if he doesn't become a lifeguard, he wants to be struck by a flying ice cream truck.
- Nasty Patty - A storm disrupts the Bikini Bottom.
- One Krab's Trash - A storm awakens the dead.
- Party Pooper Pants - The live-action King Neptune get angry for thinking that Patchy is interrupting him.
- Mermaid Man and Barnacle Boy V - Barnacle Boy tells them about EVIL.
- Born Again Krabs - When The Flying Dutchman visits Mr. Krabs.
- The SpongeBob SquarePants Movie - King Neptune tells Mindy to leave the Krusty Krab after "stalling" Mr. Krabs' execution.
- The Donut of Shame - During the opening title card.