eeewww. I thought I was watching that Soul Asylum video. What was it? Runaway Train? I kept waiting for some white guy with really bad dreadlocks to appear.
I'll try to find it. They created it to give to soldiers to give them more stamina and to be able to stay up longer, but it was driving them crazy so they stopped using it.
After they use it enough (Like some of those people) it damages their nervous system, and they start tweaking out all the time. They get nervous ticks and they'll walk all jerky, and they'll jerk their heads in a nervous twitch/tick type of thing.
One guy here in town is off it, but he's so bad that his bottom lip sags and he drools.