Royal Caribbean has a couple of rules that guests may not be familiar with. Among them is a camouflage clothing ban in particular countries . That's right, cruisers can't wear camo in Barbados and other locations.

Royal Caribbean has other lesser-known rules, including filming in one of its most popular areas, the casino . Guests are always told to respect others' privacy and to ask permission before filming anyone in the casino area.

The cruise line has other bans that cruisers keep forgetting about. This year, there seems to be one common item that Royal Caribbean security keeps confiscating, even though many guests think it's totally okay to bring on board.

Not only is Royal Caribbean confiscating the item, but in some cases, they are also leaving a note.

Here's a closer look

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