I've heard people ask what their supposed to do with the luggage that was delivered to their cabin by mistake ! Hmmmm.
People ask all the time if the food on the buffet is made fresh daily.
One couple was four days into a cruise before they realized there was a MDR.
I've seen people get called over to a customs agent as soon as they picked up their bag upon debarkation. I'm sure customs was the least of their problems.
One guy was screaming to get back on the ship because he left items in the cabin safe. One of which was a new Rolex he picked up in Grand Cayman.
One lady was complaining that she couldn't open the little round window to let some air in.