The first 2 pics that tark posted are Silkworm Pupa. The 3rd... I think, is more disgusting. It's some kind of cord thats been infected with a fungus.
Here is their description:


"Cuitlacoche is a black fungus that infects corn fields, making the kernels bulbous and swollen as they fill with spores. It also goes by the name Huitlacoche. If you're having trouble with the pronounciation, it's: Cuitlacoche (kweet-lah-KOH-chay) or Huitlacoche (dat-sfuckin-NAS-tee)."