Fly agaric mushroom

Amanita muscaria has a highly distinctive bright red cap covered with white scales. It contains the toxic, psychoactive alkaloid muscimole. Some believe that this striking mushroom was the mysterious God-narcotic "Divine Soma" of ancient India. It is extremely poisonous.

According to http://leda.lycaeum.org/?ID=8720:

"The narcotic effect begins to manifest itself about a half hour after eating, in a pulling and jerking of the muscles or a so-called tendon jump (although sometimes these effects appear only after an hour or two); this is gradually followed by a sense of swimming befoer the eyes, dizziness, and sleep. During this time, people who have eaten large quantity of mushrooms often suffer an attack of vomiting. The rolled-up mushrooms previously swallowed whole are then vomited out in a swollen, large, and gelatinous form, but even though not a single mushroom remains in the stomach, the fly-agaric eating are, in fact, intensified. Many other persons never vomit, even after eating copiously of the mushrooms.