From our Humor Department:
It was just after VE Day at the end of World War I. A German submarine was steaming back to Germany when a couple of sardines spotted them. To a sardine, a submarine seemed like a very big fish, indeed. It was strange, though — a fish made entirely of metal.
“What kind of fish is that,” one of the sardines asked. The other said, “oh, that’s just a can of people.”