Zodiac Life Boat from the Sinking of the Trashman

Origin
The Trashman was a 58-foot long sailing yacht that made routine transits between Maine and Florida. In October of 1982, the Trashman hit an unexpected patch of heavy weather off the Carolina coast. The ship sank and the five crew members got into their 11-foot Zodiac lifeboat. The first two became delusional after drinking seawater and swam away to be eaten by sharks; the third died from infected wounds. The remaining two were rescued by a passing cargo ship and returned to the US authorities.

Effects
People who touch the boat in water become extremely buoyant for 18 hours. But if they let go of the boat in that time frame, they will flip upside down and be unable to right themselves, eventually drowning.