Trial Run Crime
There are some cold-blooded reasons to rob, assault, or kill somebody, but not many more than doing so to an acquaintance or even an innocent stranger just to test the method
the criminal plans to use on their real desired target.
Anime and Manga
- Light does this several times in Death Note:
- His first victim is a man holding children hostage in a school. As the news cuts off before he can see exactly what happened, he isn't convinced.
- He next uses the Death Note on a man harassing a woman outside a convenience store. He's also able to test the "cause of death" clause by specifying the man die in an "accident" - he gets hit by a truck.
- Realizing the Note works, and with L on his trail, he begins testing the Note by having prisoners do things just before dying. He's specifically looking for limits on what they can and cannot do before dying.
- When L gets the Death Note, he wants to have a death-row convict test the 13 day rule. L dies before he can put this plan into action.
- In The Jackal, Bruce Willis's assassin character does this, killing the arms dealer who sold him his high-powered gun with that gun, to make sure that it will work when used on his target.
- The terrorist group Black September from Black Sunday recruit deranged Vietnam vet Lander to develop an anti-personnel weapon, to be used against the President while he attends the Super Bowl. Lander builds a large Claymore mine, and field tests its killing power by convincing a farmer that it's a new television camera. The poor fellow stands still, smiling, when the device goes off, riddling the entire side of his barn with holes. It may be presumed the farmer was liquified where he stood. The terrorists then plan to install these devices on the exterior of the Goodyear blimp, which will likely kill the President and thousands more in attendance.
- The first murder in the Hercule Poirot novel Three Act Tragedy turns out to be this, with the killer wishing to test if their scheme for switching glasses during a crowded party would work.
- Another Sherlock Holmes example: In "Silver Blaze", Holmes asks a person taking care of sheep if there was anything wrong with them lately. Turns out a few went lame. This confirms Holmes' suspicion the supposed murder victim was trying to cripple the eponymous horse after betting against it, and the sheep were used for practice. There was no murder; the horse merely caved the man's skull in during the preparation for the real crime.
- In Orson Scott Card's The Worthing Saga, inhabitants of the City Planet Capitol (capitol of The Empire), play an elaborate Civilization-style massively-multiplayer historical civilization-building game as a sort of spectator sport. One player, a genius named Herman Nuber, creates a Hegemonic Empire so powerful yet so beneficent and internally stable that he looks certain to Take Over the World of the game and end it in a permanent Pax Nubera. Before he can do so, Abner Doon (who turns out to be Nuber's grandson) buys out Nuber's place and undermines his empire so completely that not only does it fail to conquer the world, it is eradicated completely by universal simultaneous rebellion. Doon reveals that he considers this a trial run; he intends to do the same thing to The Empire in real life. Interestingly, while destroying Nuber's in-game empire is not technically a crime (just a supreme dick move), Doon expresses much more remorse for that than for destroying the actual Empire, saying that he did not realize what a toll it would take on his grandfather's mental health to see his life's work destroyed.
- Crime and Punishment has a variation. Raskolnikov kills a moneylender who won't be missed, mostly to prove to himself that he's an ‹bermensch and smart enough to get away with the crime. But he doesn't have any concrete plans for a larger crime afterwards, just vague ideas about reshaping the world with his will.
- In the Sherlock episode "The Sign of Three", the first victim is a Buckingham Palace guard found near death from a stab wound with no weapon in sight, in a locked-room mystery. Turns out that the killer had attempted to kill him for no other reason than to test a method intended to be used on another victim. The "test" victim lived (because Watson was there to give him medical treatment). It was a plot point, since It made it clear that Watson would be able to save the second victim (his old friend and wedding guest).
- The "Love Run Cold" episode of CSI: NY had the detectives discover that a cat whose owner lives near the suspect was poisoned in the same way as the Victim of the Week (using a substance said suspect uses to prepare food she's photographing) and the cat's owner suspected she did it.
- In the Doctor Who episode "Journey's End", Davros tests his 'reality bomb' on a group of unlucky civilians abducted from earth before magnifying it with the intention of using it to rip apart the entire multiverse.
- One episode of Lois & Clark involved numerous headless bodies being found all over Metropolis. Turns out a millionaire with a disfigured body intended to transplant his head onto Superman's body and the doctors were testing the technique.
- In the The Blacklist, a SVR assassin named Karakurt runs a test to see if he can kill someone with a virus through touching someone. The FBI is baffled on why a college student was targeted until they find out that he's suppose to target an anti-Russian politician and even if that doesn't work, one of his contacts uses the virus so that the Alliance/Cabal can use Liz as a stooge.
- In an episode of Hawaii Five-O, would be terrorists want to introduce a weaponized ebola-like illness to the population using bees. They lure a random Island dude to their remote location with the phony promise of a job interview, and then lock him in the room and flood it with infected bees to make sure they can effectively spread the disease (and that the disease will have its intended quick-kill effect).
- In an episode of Psych, Spencer deduces that the robbery of an ice-cream truck was a test run for the planned robbery of an armored car using the same method.
- An episode of Criminal Minds had the BAU hunting down an apparent serial poisoner that had killed various people around town. After some investigation, they discovered that the poisoner had placed his poison in the glue of some stamps (which he then placed on the local post office), and he had done this to test the way through which he was going to kill all of his co-workers (that were pissing him off) in a corporate team-building meeting.
- In an episode of Leverage, during a job recovering a stolen painting, the team encounters a group of thieves who get the painting before them. They discover that the thieves were put together by an old grifter associate of Sophie's, Starke. Starke's M.O. is basically to form a one-shot team and have them do one job as a practice run, presumably to make sure they can work together, before going after his real target. The stolen painting was the practice run, so the Leverage team have to figure out what Starke is after first and get it before him in order to get the stolen painting back.
- In strip #906 of The Order of the Stick, this is the motive Nale gives for murdering Malack's vampire "children".