Carpet

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http://ask.metafilter.com/122697/What-are-the-ramifications-when-a-real-estate-disclosure-is-misleading-and-nasty-surprises-are-revealed-after-sale

"Here they found a hideous scene: between the new carpet padding and the hardwood is a thick layer of dried, saturated blood and crunchy tissue which appears to be brains. The residue runs the entire length of the hallway, some 15 feet, with distinct lines at each of the five doorways. Despite the disclosure that the shooting happened in the back room, the blood evidence makes it clear that the suicide closed himself off in the smallest area of the house, the hallway, and shot himself there. The body was removed, the walls repainted, but the residue of the shooting was never cleaned up. Instead, someone had laid down new carpeting to give the impression of cleanliness."