Drugs and literature.
Philip K Dick, speed
The great sci-fi writer's intensive use of speed and hallucinogens inspired much of his work. One particular drug, Semoxydrine - similar to speed - fuelled him in the manic production of 11 sci-fi novels, some essays and short stories all in the space of one year between 1963 and 1964.
Hunter S Thompson, everything
Thompson, pictured right, wrote the infamous 1972 book Fear and Loathing in Las Vegas, about a road-trip he had taken in 1971. His alter-ego narrator sets out with 'two bags of grass, 75 pellets of mescaline, five sheets of high-powered blotter acid, a salt shaker half full of cocaine, and a whole galaxy of multi-colored uppers, downers, screamers, laughers'.