I worked on a 130 foot square rigged ship that took people out for a few hour long cruises around Sydney Harbour. There were a some funny things that came up. One guest (probably been to Disney recently ) asked if the ship ran on rails underwater. Another, after being on the boat for 2 hours, sailing on the calm harbour waters, was standing on the dock said "I must have gotten my sea legs, it feels like the dock is moving!" I looked down, as the wash of a passing ship died away, and said "it's a floating dock." Most disappointing that I didn't have a good comeback for either of these.