Subscribe | UPI Odd Newsletter Subscribe Oct. 26 (UPI) -- Authorities in Washington investigated a report of human remains in a cave on a river and arrived to find the sunken skull was actually a plastic beer bong. The Washington Department of Fish and Wildlife Police said an officer responded alongside a Pend Oreille County sheriff's detective and a Border Patrol agent when a paddle boarder reported seeing human remains in a cave on the Pend Oreille River, near the Canadian border. Advertisement The investigators took jet skis to the cave entrance and swam inside, where they spotted what appeared to be a skull underwater inside the cave. The apparent skeletal remains turned out to be a plastic beer bong shaped like a skull and spinal column. The beer bong had been filled with rocks, leading investigators to suspect it was intentionally placed under the water as a prank. Read More Two bears escape enclosure at Indiana home 92-year-old man hikes Grand Canyon rim-to-rim Python caught after 4 months on the loose in Oklahoma