This is based on opinion. Please don't list it on a work's trope example list.
Nightmare Fuel / Very Bad Things
Jeremy Piven's character accidentally impales a prostitute's head on a towel hook during rough sex and kills her.
The fact that this could be looked at as an early, more brutal version of The Hangover.
The Prostitute and The Security Guard are dismembered and buried in the desert and most of the people involved in the crime are dead, so this means that not only will their murders likely never be solved but their remains will likely never be found.