The Screams of Brahmin is a holotape in Fallout: New Vegas, and is part of the quest of the same name.
Location
It can be found on a nightkin near the McBride house. The nightkin's hatred towards the brahmin is caused by severe psychotic side effects of prolonged Stealth Boy use.
Transcript
Most of what is recorded here is a mess of incomprehensible psychotic gibberish. It seems to express a general frustration towards a set of brahmin who are allegedly keeping the author awake at night by screaming inside his head whenever he closes his eyes
