system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do cockroaches flip upside down when sprayed with an insecticide?
gpt
Many pesticides are organophosphates.  This means they are essentially a very dilute form of nerve agent.  Some of the most lethal poisons on Earth were discovered when scientists were trying to research pesticides.  Anyway, the principle mechanism for death by nerve agent is that the toxin causes all the muscles in the body to experience uncontrollable contractions.  If the dying insects are twitching back and forth, that’s because their bodies are seizing.  It’s actually a very horrible way to die.