I crab fished the Bering Sea for about 10 years and we had a ton of them. Some may apply some wont, but they were all taken very seriously. Here's a few: No living plants onboard (draws the boat to land) Never open a can upside down. Never turn a hatch cover upside down on deck. Never whistle in the wheelhouse. Never bring a suitcase on board. (seen more than one skipper throw them overboard) And probaby the biggest one is never EVER leave town to head for the fishing grounds on a Friday.