Wow, plain old nutmeg. Who knew? I use it a lot when making cakes or falafel.
Apparently, in its freshly ground form, nutmeg contains myristicin, a psychoactive substance that can cause hallucinations and memory lost.
Quoting from Wikipedia:
In low doses, nutmeg produces no noticeable physiological or neurological response, but in large doses, raw nutmeg has psychoactive effects. In its freshly-ground (from whole nutmegs) form, nutmeg contains myristicin, a monoamine oxidase inhibitor and psychoactive substance. Myristicin poisoning can induce convulsions, palpitations, nausea, eventual dehydration, and generalized body pain. It is also reputed to be a strong deliriant.
So there. Careful with the nutmeg folks.