So, my dear tobacco hornworm, you thought you could destroy my tomato plants and get away with it, eh? Now, what you gonna do about those Cotesia congregata cocoons sticking out of your body? Evil laugh
Caterpillars are attacked by a braconid wasp (Cotesia congregata) that lays dozens of eggs within each larva [=caterpillar]...The host caterpillar is doomed, consigned to a slow death that may not follow for weeks*.
But evil laughs aside, let us not forget what Richard Dawkins said: Nature is not cruel, only pitilessly indifferent.
*David L. Wagner, Caterpillars of Eastern North America, Princeton Field Guides, 2005.