Flying Pig City... I assume it refers to the little piggies' souls going up to heaven.

JazzO, does talk of flying pigs have connotations of total impossibility over your side of the Pond?

Here we'd talk about completing a project with an unrealistic timescale "at the same time as building a runway for the flying pigs".

Or someone says "Yes, I'm sure we can do that" and somebody else points out of the window and says "Look! A flying pig!"

Interesting that fish on a bike isn't used in the same way, as on the face of it there's some kind of relationship. Which I would, of course, strenuously deny.