Speed ROCKS!!!! Do a line of meth and you're off to the races! You will have the deepest and longest conversations with absolute strangers...it's great!
I haven't done it in over 8 years but it's one of the things that helped me through college. If you couldn't concentrate on studying then do a small bump and viola...you're a study machine for 8 hours! It does freak me out when I see people shoot it up and smoke it.