Re: Have you ever hit a shipping container?
It's not uncommon for shipping containers to float just a few feet below the surface for a few hours or so on their way to the bottom, meaning there is no way you'd see it on a dark night and you might just notice a strange wave pattern during the day - if you're looking that way. Given that they are usually only lost during storms, you'd have to be sailing through a shipping area a day or so after a storm, so the chances of hitting one are slim, but, like the chances of hitting a whale or a sunfish, it does happen..
A nice old timber motorboat was crossing Whitsunday Passage one night late last century when it was sunk by the periscope of a submarine on route to Cairns. Stuff really does happen out there.
From RFC 1925: "(3) With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead."