The cockroach and the wasp.
The roach, its escape reflex permanently disabled, will simply rest in the den as the wasp's egg hatches. A hatched larva chews its way into the abdomen of the roach and proceeds to live as an endoparasitoid. Over a period of eight days, the wasp larva consumes the roach's internal organs in an order which guarantees that the roach will stay alive, at least until the larva enters the pupa stage and forms a cocoon inside the roach's body. After about four weeks, the fully-grown wasp will emerge from the roach's body to begin its adult life.
UGH! Later, QD.