What do the Salem witch trials, LSD, and dinosaurs have in common? They all have some connection to ergot, a fungus known to cause hallucinations, poisoning, and other terrible symptoms both in humans and animals. The ergot fungus grows on grains and grasses in wet, cool climates, and it has a long and sordid history. Ergot is used to derive the drug LSD, and it is also considered a possible cause for the mass hysteria of witch trials. You know how it goes: People eat bread made with ergot-contaminated grains, they start having visions, they accuse their neighbors of being witches... it's just a classic tale as old as civilization. Or maybe even older.