On a number of cruises I have been on they have read the stupidest questions they have received.   Here are the ones I remember.

Does the ship have its own generator.? (no- a very long extension cord)
What time is the midnight buffet?
Where is the down stairways? (probably near the up stariways)
Do the crew live on the ship? (no they fly them in every morning)
Do I have to declare the bottles of whiskey I bought if I drank them?
(in a Canadian store) Are these prices in Canadian dollars?
(to the Photographer) How will I know which picture is mine?
What altitude does the boat ride at? (how about sea level)