Acid is a ridiculously powerful drug. It's measured in micrograms (that's 10 to the negative 6, kids). A few hundred micrograms is enough for a fairly decent trip that'll last between 8-12 hours.
Guaranteed to blow your freakin' mind. I strongly suggest listening to the Grateful Dead while under the influence. It is not advisable to drive or operate heavy machinery while tripping. Going to work or attending class while zonked out of your gourd is also discouraged; the fact that your pupils will swallow your entire eye is a dead give away that you're on something.
A truly marvellous man made hallucinogen that could, one day, replace calpol.
i appear to have eaten something bigger than my head.