More than 90 passengers and crew members on a Royal Caribbean International cruise ship which set sail from Tampa, Florida, on Feb. 1 for a weeklong cruise came down with a gastrointestinal illness, causing vomiting and diarrhea.

On most any cruise ship, passengers get frustrated by “chair hogs,” or people who try to claim a pool deck lounge chair for an extended period of time by leaving their belongings on it and then disappearing. Cruise lines discourage this behavior but it persists, especially on Carnival and Royal Caribbean cruise ships.