Jure Sterk's Ballpoint Pen

Origin
Jure Sterk (1937 – 2009) was a Slovenian long-distance sailor and author, who went missing during a sailing trip around the world. During his sailing career he crossed the Atlantic, Indian and Pacific Oceans. Between 91 and 94 he sailed around the world single-handedly. In 2007 Sterk started a journey to sail around the world on his boat Lunatic. Two months after he left his boat was discovered about one thousand nautical miles off the coast of Australia. The sails were torn and no one was on board, there was other signs of damage as well and no sign of Sterk on deck. The last log mentioned that sharks were approaching him after the motor was damaged.

The pen washed to shore years later and was used to cause several shark attacks off the coast of Australia until it was collected.

Effects
Controls sharks, allowing Jure to escape his boat without a trace. After twenty-four hours the sharks turn on the user.