Good Idea Paul! Here are my favorites, although I personally have not committed any of these.
When a cruiser has a balcony or suite w/balcony stateroom and the cruiser gets extremely drunk and does one of the following 3:
1) Stand on Balcony railing and attempt to "relieve" yourself overboard.
2) Attempt to have "Intimate" relations with your cruisemate on the balcony railing.
3) Stand on balcony railing and imitate the scene from "Titanic" and scream "I'm king of the world!!!!!!"
Any one of these three could be dangerous to a cruiser. I believe all three have happened at one time or another on a cruise, but I cannot recall when or on what ships. They all probably sued and got millions for their own stupidity!