My friend snorted one, he got mildly "fucked" but came down after an hour or so.

I took 2 at school, and was the most focused, most dilligent student you'd ever fucking seen. lol For about 4 hours.

I was writing down EVERYTHING, quizzes were an effin' sinch, homework was done in all my classes before the class got done. It was nuts. REALLY good stuff.