The comedy inherent in this trope can be deliberate on the ghost's part or not. Silly Spooks that don't want to be funny tend to be portrayed as hilariously incompetent at scaring people, which is often their job.
Despite the name, this trope can apply not only to ghosts, but to any stereotypically scary supernatural being.
The Trope Namer is The Haunted Mansion ride at Disney Theme Parks and the assorted media directly based upon it. Compare Friendly Ghost, who is also a non-scary but not necessarily funny spirit, or the Reluctant Monster who isn't even aware of its role.
- General Mills' monster-themed breakfast cereal Boo Berry has a ghost as a mascot. In the original ad, Frankenberry and Count Chocula both are scared of the ghost and perform a Security Cling with each other, despite the fact that they're a Frankenstein's Monster and a Classical Movie Vampire. But Boo Berry just wants to share his cereal.
- The first ghost-types to appear on Pokémon turned out to be pretty funny. They're fond of Tex Avery-esque Eye Pops and Wild Takes and clearly see their hauntings as pranking Ash and Pikachu, not attacking them.
- Elizabeth, the Cute Ghost Girl in Maburaho, takes a liking to Kuriko, because her large breasts remind Elizabeth of her mother. In fact, she mistakes Kuriko for her mother because of Kuriko's breasts. When Kazuki and the girls help Elizabeth out to escape from the house in which she's been bound, she opens up and becomes quite playful.
- The 1944 film version of The Canterville Ghost has the ghost being a big coward, as are all his descendants. He can't pass on until a descendant does something brave.
- In the Abbott and Costello film The Time of Their Lives (1946), Lou Costello plays a ghost wrongly accused of treason, just trying to clear his name (with the typical Costello bumbling, cowardly comedy).
- The ghosts in Topper and its sequels are helpful but often mischievous.
- The Title Character in Beetlejuice qualifies. Referring to him, the movie's tagline was "The name in laughter from the hereafter!"
- While the film is a comedy, "Beetlejuice" himself is more of a Monster Clown.
- Stuart and Cyrus from The Frighteners.
- The ghosts in Harry Potter are mainly there for comic relief, though they become relevant to the plot occasionally.
- "Colonel Fazackerley Butterworth-Toast, Bought an old castle complete with a ghost." Upon their first meeting, the ghost tries to scare the Colonel away from the castle, but the Colonel is instead entertained by the ghost's antics. When the Colonel goes so far as to call out for more, the ghost gives up and never appears again.
- The nameless ghost in Lewis Carroll's "Phantasmagoria" is a bit of a goof with a taste for awful puns. He also mooches food and drink off the narrator.
- The Trope Namers are the ghostly stars of The Haunted Mansion ride at Disney Theme Parks, who are clearly more interested in partying than anything frightening or sinister. Even "Grim Grinning Ghosts", the ride's Theme Song, admits that these ghosts only \"Pretend to terrorize\".
- Emma and Ezra from the 2003 film adaption are these.
- Moshi Monsters:
- Zoinks the ghost and his cousin are mischievous pranksters.
- McScruff the ghost is a practical joker.
- In Super Mario Bros. we have the Boos, known for nearly always sticking their tongues out at you like a kid making a silly face and hiding behind their hands when Mario looks at them as if they were playing Peek-A-Boo.
- Kogasa from Touhou Project is a Karakasa whose main ambition in life is to Jump Scare people and surprise them. Unfortunately, she's a Cute Monster Girl, so all her attempts end in failure.
- Undertale has Napstablook, who does funny things like leading you to believe that he's asleep when in fact he's awake and saying "ZZZ" out loud, as well as Mettaton, who has more of a Large Ham comedic style
- Yo Kai Watch has Whisper, a Know-Nothing Know-It-All who's known to occasionally make cheesy puns and transform himself to go along with the jokes.
- Wanda from Baman Piderman giggles, plays pranks and does cutesy things like boop Piderman on the nose and make an origami crane kiss Pumkin.
- Casper as portrayed by the Nostalgia Critic. The silliness comes from how Out of Character it is for Canon Casper to be malicious and from the fact that he's still not scary even with the meaner personality.
- Hairy Scary, pictured above, more so than Casper in Casper and the Angels. Casper is supposed to be a "guardian ghost" to the Space Cop Angels along with Hairy, but the latter brings about most of the show's laughs.
- The Funky Phantom, who is a scaredy-cat ghost.
- Slimer, the team mascot/pet in The Real Ghostbusters. Instead of "busting" him, the team lets him hang around and be the Comic Relief.
- The ghosts in the classic Disney short "Lonesome Ghosts". They call ghost exterminators Mickey, Donald and Goofy so they could have someone to scare, and are clearly having a ball while doing so.
- Danny Phantom: Danny Phantom himself qualifies. Although he possesses the power to become a ghost (which tend to be the source of most misfortune in the Danny Phantom universe), he is generally a pretty outgoing, Book Dumb kid who can be a bit of a Butt-Monkey. There's also the Box Ghost ("BEWARE!"), whose job is to haunt...boxes. Absolutely no one is afraid of him, and his bothering the main characters is a recurring gag.
- The Title Character of Beetlejuice (see Film above).
- The animated character is far Lighter and Softer than the film version and fits the trope much better.
- The Wacky Races episode "Creepy Trip to Lemon Twist" features two mischievous ghosts in the abandoned saloon. They play pranks on some of the racers, until Big Gruesome turns the tables on them.
- Regular Show's Hi-Five ghost doesn't have much in the way of a developed personality, but his design is definitely silly. He looks like a Bedsheet Ghost or a Pac-Man ghost with a single arm and hand growing out of the top of his head.
- Scooby-Doo Meets the Boo Brothers: The Boo Brothers, who come across as a ghostly version of the Three Stooges.
- Spanky and Crudde from the OK K.O.! Let's Be Heroes episode, "Parents Day".
- Spooky, the little spook in the Cool Cat cartoon "Big Game Haunt," is a hybrid of Casper and Elmer Fudd.