Kidstoned Chewable Valium
Ukraine. I was about 16 yo.
Used that opportunity wisely - downloaded a bunch of porn and tutorials on 3d modeling, texturing, rendering, level-design etc.
Short version - I was young 8)
Long version:
At that time "internet" was just a fancy word from sci-fi genre in my hometown. My friend was one of the lucky guys to have cheap night-time tariff, but couldn't use it because of exams and he let me use his connection at night time. For free. No registration and stuff. C'mon, how could I resist?!
Alas I wasn't able to sleep during daytime - also studying.
First two days I was managing just fine. Then sleep deprivation slowly took its toll.
At 4th day I had approximate knowledge of many things. Such as where am I and what I planned to do few seconds ago. Falling to microsleep randomly on blinking. Walking like a drunk and talking like a zombie.
Altered state of consciousness produced by sleep deprivation was interesting, though I was too exhausted to enjoy this experience. Thats when I decided I had enough and slept for 16 hours.

Hope you liked my little story and pardon my bad english.
I wouldn't call it "normal" functioning 8)
Sure on uppers you don't need sleep and food, but without chems I was a zombie on 4th day.
...and I need to learn how response button works
Because its easy to make suggestions to visual/graphical stuff.
To suggest something for code "improvements" you need to understand at least a little bit how particular piece of code works.
QuakeLive
Nah, I know few girls in QL, they are pretty nice to play and talk to.
I guess they rather throw up in a hour or two.
But yeah, don't do it at home.