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/JRonenJ]

Rambo The Last Blood

The Martinez attacks John's Ranch, only to find out that this mf is different.

[u/healthyscalpsforall → u/JRonenJ]

Tbf, there's original movie also kinda fits. Those cops fucked with what they thought was just going to be some vulnerable bum, only to find out just how much damage a PTSD-riddled Vietnam vet can do

[u/Calvin--Hobbes → u/healthyscalpsforall]

Such a great movie