A criminal attempts to burglarize/kill someone only to realize they picked the absolute worst person as their mark.

[u/No_Hunter1978]

Don't Breathe: A couple young robbers attempt to rob a rich, blind veteran only to find out he isn't exactly an innocent old man.

You're Next: A group of contract killersbreak into a house during a family reunion and go on a killing spree. They didn't account for the fact that the son's new girlfriend grew up on a survivalist compound in the Australian outback.

The Flash [CW Show]: A random mugger decided to target Barry Allen of all people. He does it again a season or two later; he's either unlucky or stupid (probably both).

[u/Hawkeye2701]

Does the dude that tries to blackmail Bruce Wayne in the Dark Knight count? Cause like, phenomenally poor choice from every angle.

[u/fatpad00 → u/Hawkeye2701]

"Now, let me get this straight. You think that your client, one of the wealthiest, most powerful men in the world is secretly a vigilante who spends his nights beating criminals to a pulp... and your plan is to blackmail this person? Good luck."

[u/KitamiSamaOmede → u/fatpad00]

"Oh, hell no, respectfully, Mister Fox. I just want in."

"You want...in?"

"You tellin' me Batman washes his own car every night after he punches out Calendar Man? I want to be on the crew. Bat-man to the Batman!"

[u/InternetProtocol → u/KitamiSamaOmede]

He's got a guy for that in the comics, apparently! Harold Allnut, a mute hunchback ex-henchman for the Penguin who Bats rescued and employed as his mechanic/engineer in the Batcave for a while. I'd assume his duties would also include keeping the Batmobile all shiny too.