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The Enumclaw horse sex case was a 2005 incident in which Kenneth Pinyan (June 22, 1960 – July 2, 2005), an American Boeing engineer residing in Gig Harbor, Washington, died from injuries received during anal sex with a stallion at a farm in an unincorporated area in King County, Washington, near the city of Enumclaw.

During a July 2005 sex act, videotaped by a friend, he suffered a perforated colon from receptive anal intercourse from a stallion and later died of his injuries. The story was reported in The Seattle Times and was one of that paper's most read stories of 2005. It was informally referred to as the "Enumclaw horse sex case". Video footage of Pinyan and a horse was later disseminated through the Internet.

A documentary of the life and death of Pinyan, and the life led by those who came to the farm near Enumclaw, debuted at the Sundance Film Festival 2007 under the title Zoo. It was one of 16 winners out of 856 candidates for the festival, and played at numerous regional festivals in the United States thereafter. Following Sundance, it was also selected as one of the top five American films to be presented at the prestigious Directors Fortnight sidebar at the 2007 Cannes Film Festival.