Tangent: I wonder how interesting (or useful/useless) it would be to train an image classifier using http://www.onemilliongiraffes.com/ and then start looking at a bunch of random pictures.

Could it be a repeatable way to find things like the face on mars http://en.wikipedia.org/wiki/Cydonia_(region_of_Mars)#.22Fac... except... a giraffe on mars?

Who knows, there could be giraffes everywhere, we're just not seeing them.