Selfies while traveling can be fun. Smiling in front of the Eiffel Tower, hugging at the Trevi Fountain and strutting in front of the Kremlin are all ok. However, if you’re on a cruise and climb up to point your camera or smartphone while standing on the ship’s railing is a no no.

Despite warnings, a couple did it while on a recent Royal Caribbean cruise. They were kicked off at the next port and had to pay all return home expenses. Additionally, Royal Caribbean banned them from ever sailing again on the cruise line. Simple solution: With or without your smartphone camera, when traveling, always be aware of personal dangers you may encounter, aboard cruise ships, high buildings and elsewhere, and follow all safety rules.