Unsinkable Sam's Paw

Origin
Unsinkable Sam was the nickname of a German ship's cat who reportedly saw service in both the Kriegsmarine and Royal Navy during the Second World War, serving on board three vessels and surviving the sinking of all three.

Effects
Technically the bones, this is the remains of Unsinkable Sam. Holding it allows the user to survive any nautical incident through uncanny luck. It's funny how it's been used every time someone got ahold of it.