Not that this is related or anything, but Cav's disclosure made me think of the Simpsons....
Burns: You know, Smithers, I think I'll donate a million dollars to the local orphanage...when pigs fly!
[They laugh. Homer's bbq pig flys past]
Smithers: Will you be donating that million dollars now, sir?
Burns: Nooo, I'd still prefer not.
audio:
pigsfly.wav