I took speed twice in my life, and the first time I thought it would help with a presentation and I ended up researching about the dogs in the film The Duchess for three hours. My lecturer was happy with the full history of the dogs, though.
The second time I used it to clean my house. I have no interest in doing amphetamines again, and this was nearly a decade ago, however I will say my house has never looked as clean as those few hours. I was getting into the grooves with a toothbrush at one point. 3 bedroom house cleaned top to bottom in half a day.
Years ago I realized I was drinking six 24 oz. cups of coffee a day - which is literally MORE THAN A GALLON OF FUCKING COFFEE. One of those cups was even right before going to bed, which is a sign of how much tolerance I had built up to caffeine. Now I just drink one 8 oz. cup every morning and that's it, and my desire to slap the shit out of every human being I encounter has gone way down.