->''"Why don't we all drink some very sexy wine?"''

GeneWilder's 1975 directorial debut. Many fans will recall that Franchise/SherlockHolmes did in-fact have an older brother, Mycroft, who was by all accounts indeed smarter than Sherlock, yet [[BrilliantButLazy too lazy]] to accomplish what Sherlock had. This film follows his ''younger'' brother Sigerson's DayInTheLimelight.

Jenny Hill (Madeline Kahn), an opera singer and bride-to-be of the new Minister of Defense, is blackmailed into stealing the [[MacGuffin "Redcliff Document"]], which details Great Britain's defense plans. The blackmailer (Creator/DomDeLuise) intends to sell the document to Professor Moriarty (Leo [=McKern=]), who in-turn plans on selling the document to the highest bidder. Since Holmes & Watson are on holiday, Sgt. Orville Sacker (Marty Feldman) of Scotland Yard seeks out the services of Sherlock's younger brother, Sigerson, also a detective. Sigerson (Wilder) is insanely jealous of his older brother's success, and yearns for the day to prove his own self-proclaimed superior intellect.

The rest of the movie runs mostly on RuleOfFunny.
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!!This film includes examples of the following tropes:

* AllPartOfTheShow: Sigerson, Sacker and Moriarty's assistant during the opera.
* AmbiguouslyGay: Gambetti
* ArmorPiercingQuestion: Sigerson uses the "repeatedly ask a question" version on Jenny Hill twice.
* AuctionOfEvil: Moriarty's mini-auction between Russia and France for the Redcliff Document.
* BigDamnHeroes: Subverted. [[spoiler: Sherlock helps Sigerson save Jenny Hill from an assassin at the last minute, but stays in the shadows in order to let his brother win one all on his own]].
* BluffTheEavesdropper: Sherlock and Watson are in a room when Holmes silently informs Watson that there's someone listening at the keyhole. They then have a conversation intended to fool the eavesdropper that they're leaving the country.
* BottomlessMagazines: Averted when Moriarty confronts Sigerson.
* BreakingTheFourthWall. In TheCameo below, Albert Finney turns and talks to the audience, wondering of the opera was really "rotten, or just wonderfully brave".
* BrickJoke: "[[EarWorm The Kangaroo Hop]]".
* TheCameo: Albert Finney as an opera patron who criticizes Gambetti's performance.
** Mel Brooks dubs the voice of the henchman who's fed to a tiger.
* TheCastShowoff[=/=]IronyAsSheIsCast: The former is Madeline Kahn, and the latter is Dom [=DeLuise=], both singing opera.
** One can argue Wilder is also a Cast Showoff as he was an accomplished college fencer.
* [[ChekhovsSkill Chekhov's Skill]]: Sigerson is practicing fencing when we first meet him.
* CloudCuckooLander: Gambetti.
* {{Confessional}}: Parodied by Moriarty's coin operated robot version.
* CountingBullets: Happens when Moriarty is about to shoot him with a Webley's #2.
* CurtainCamouflage
* FanDisservice: After escaping Gambetti's DeathTrap, both GeneWilder and Marty Feldman are left bare-assed.
* {{Flynning}}: The sword fight between Sigerson Holmes and Professor Moriarty.
* FreudianExcuse: Sorta... Moriarty claims he has a hereditary condition that causes him to do something "absolutely rotten" every 24 minutes.
* GenreSavvy: Gambetti doesn't hand the Redcliff Document over to Moriarty right away, because he knows that once he does, Moriarty will decide that [[YouHaveOutlivedYourUsefulness he has outlived his usefulness]], and send some goons over to beat him, and take his money back. As he is saying this, Moriarty is preparing to smash a vase over his head.
* GroinAttack: Multiple examples.
* [[HoYay/SherlockHolmes Ho Yay]]
* InstantSedation: The pills Sacker puts in the wine during the opera scene.
* LargeHam: Everyone indulges in it, but Moriarty is the largest of them all.
* MadMathematician: Moriarty is supposedly a professor of mathematics... yet he doesn't seem to be able to perform long division with decimals.
** 2+2=4 is the only correct math problem on a board behind him in one scene. The rest are either incorrect or have a question mark under the answer.
* MsFanservice: A lot of characters spend a lot of time either groping Madeline Kahn's boobs, or talking about groping her boobs.
** Including Wilder writing and directing himself in the longest one of all.
* TheNapoleon: A strange inversion. Moriarty is a good six feet tall, yet still stands on an elevated platform to make himself appear taller than his henchmen (other than just having them crouch down when he talks to them).
* NonSequiturThud: After a GroinAttack with a [[ItMakesSenseInContext giant shoe]] -- "Oh taxi!" ''[thud]''
** Also counts as a VisualPun since he's quite literally given the boot.
* NoodleIncident: The Case of the Three Testicles.
* OldFashionedRowboatDate: Sigerson Holmes and Jenny Hill go for an outing in a rowboat. Since this is a comedy, Sergeant Sacker comes along as the rower and his accidental mistakes with the oars repeatedly cause Sigerson to be splashed in the face with water.
* PhotographicMemory: Sgt. Sacker has ''phono''graphic memory -- he can exactly repeat anything he has ever heard. At one point he begins to skip like a record.
* PrettyInMink: Jenny wears a white fox muff on the rowboat date.
* PushedInFrontOfTheAudience: The "getting on stage is the only way for them to get close to a MacGuffin" version occurs. Sigerson Holmes and his {{Sidekick}} Sergeant Sacker go onstage as actors during an opera to recover the Redcliff Document.
* RightHandCat: Moriarty has a cluster of small snakes.
* SherlockScan: Parodied. Sigerson twice makes a deduction about who is about to walk through his door based on the sound of their footsteps on the stairs outside the door. He's completely wrong, and someone else entirely walks in.
* ShoutOut:
** The scene where Moriarty tricked his henchman Bruno to his death was a reference to Frank Stockton's short story "The Lady or the Tiger?"
** Moriarty's being forced to do something evil every 24 minutes was a tribute to Creator/GilbertAndSullivan's ''Theatre/{{Ruddigore}}'', which had a man cursed to perform an evil act every day or die.
* TheShowMustGoOn: Sigerson Holmes and Professor Moriarty (and their minions) engage in a secret contest behind the scenes of an opera performance to get some important papers. Their shenanigans include dropping sleeping pills into the cups the actors are drinking from, firing guns and breaking into song: the actors try desperately to keep the opera going despite the interruptions.
* ShownTheirWork: The songs Jenny sings are actual music hall songs.
** The movie itself is absolutely packed with subtle gags only dedicated Sherlockians would get.
** "Sigerson" is an alias Sherlock Holmes uses when he's presumed dead after "The Final Problem" but before his return in "The Empty House".
* SmallNameBigEgo: Sigerson isn't quite the genius he proclaims himself to be.
* SwordCane: Sigerson uses one while fighting the {{mooks}} during the carriage battle.
* StylisticSuck: Gambetti's English translations of Italian operas.
* VocalDissonance: A running gag has what sounds like a woman knocking on the door to Sigerson's office and calling him, and when he tells "her" to come in, it turns out to be his manservant Hunkston.
* WhipItGood: When Moriarty's henchman fight Sigerson atop the carriages.
* YouHaveFailedMe: Moriarty feeds one of his {{Mook}}s to a tiger for failing to tail Holmes & Sacker (and because he needs to do something evil every 24 minutes).
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