It's easy to turn your feces different colors after excretion, but what about changing its hue before it exits the body? This FAQ is devoted to this hip, new art form: pre-excretion fecal coloring (or "Prefec).
Drinking large quantities of grape Kool Aid (at least one quart in a period of a few hours) had been shown to turn your feces green (not purple, as one might imagine). It has not yet been determined whether other flavors of Kool Aid have the same effect.
The holy grail of Prefec is to make one's feces glow. Although many have tried to achieve this lofty goal, so far none have have succeeded. This FAQ is dedicated to the memory of these brave souls.