(via Wikipedia)

5. Anyone who thought it was a good idea to take a cruise after the year cruises had in 2013. A 10-day Royal Carribean cruise was cut short by two days after over 600 people on board came down with what was likely a norovirus. Noroviruses present with diarrehea, vomiting, and abdominal cramps, so it's also possible all 600 people simply overindulged in the chocolate fountain on Deck Seven. The bigger question here, of course, is how thousands of people were fooled into taking a cruise after all the cruise disasters of the last 12 months. Sure, that was mostly Carnival, but I for one learned an important travel lesson: a bunch of people in isolation together inevitably ends with poop everywhere.