A new spider has just been discovered in Mexico that can rot human flesh.
The Loxosceles Tenochtitlan posses a potent tissue-destroying venom that can create necrosis lesions on the skin.

These lesions can reportedly take multiple months to heal, permanently scarring the individual that should be so unfortunate to come in contact with one of these creepy-crawlies.
More sever issues can happen with children in particular.
Moral of the story? Be sure to double check your furniture as they love to live there.