[Cadaverous Pallor]

To clarify what EH1812 said - in the art of Wall-E book it said that the original concept was that you weren't told that the blobby alien-like creatures were actually humans after 700 years of (de-)evolution until the very end. The concept drawings were much more jelly like and totally non-human. I think that might have been better but the book claimed that it confused people, and in a movie with little dialogue they ruled it out as too much of a risk.