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Nightmare Fuel: The Wire
Season 4 took this concept to new heights with Snoop and Chris, Marlo Stanfield's enforcers. The duo go around wantonly executing rival drug dealers and hauling anyone who doesn't bow down to Marlo into a vacant house, where they murder them and leave their bodies in impromptu coffins. The worst example of this occurs the first time we see their process, as Snoop and Chris calmly discuss how they're going to preserve the dead body right in front of the victim they're about to execute. The worst part is the dealer's please ("Chris...please.") and his nonchalant response ("Don't fret, boss. I've got you covered. Quick and clean, I promise"), then Chris shooting him after he's just vomited all over the floor.
Marlo ordered one man murdered simply for "talking back". This man was a security guard at a convenient store that Marlo pilfered two dum-dums from. All the security guard asked for was a little respect. By the end of the fourth season, the cops have found 22 bodies in vacant houses, and who knows how many other bodies there might be.