Some wasps are so horrible famously they made Darwin question God: "I cannot persuade myself that a beneficent & omnipotent God would have designedly created the Ichneumonidæ with the express intention of their feeding within the living bodies of caterpillars."
From the wasp talk thread:
Some wasps are so horrible famously they made Darwin question God: "I cannot persuade myself that a beneficent & omnipotent God would have designedly created the Ichneumonidæ with the express intention of their feeding within the living bodies of caterpillars."
http://www.darwinproject.ac.uk/entry-2814 - above quote
http://www.radiolab.org/2009/sep/07/ - first 12 or so minutes but great podcast overall
http://www.popsci.com/scitech/article/2008-06/voodoo-wasp - poorly written article