“You have done something to your brain. You have made it high. If I lay 10 mls of diazepam on you, it will do something else to your brain. You will make it low. Why trust one drug and not the other?” ActingBrainWeedDrugsIBenzosDiazepamWithnail Book:Withnail and I: the Original Screenplay Source: Withnail and I: the Original Screenplay