Strychnine might be the most famous name on this list; rumored, fictional, or documented cases of death by strychnine poisoning include Alexander the Great, blues legend Robert Johnson, and two characters from Psycho. And it's not an easy way to go, either. Ingesting this rodenticide has several gruesome stages. First, severe nausea and vomiting can occur; next, convulsions begin, lasting longer and occurring more frequently as the chemical courses through your system. If you survive the violent seizures, you'll end up in a rigor-mortis-like muscle lockdown, leading to death by asphyxiation.