I have a theory that going to the bathroom is a pivotal point in any drug experience. Besides being super daunting when you're high, bathrooms are the place where everybody freaks out. Suddenly, you're alone, in a place full of pure white and clinical surfaces. A familiar task, which you've probably done a million times over your lifetime, becomes infused with strangeness. It's not until you go to the bathroom that you realize how fucked up you really are.
This video is one man's story of his bad acid trip, which is pretty funny now but probably wasn't funny at all at the time. It corroborates my theory. :)