All the colors are brighter, sometimes you see what seem to be like each individual cell of everything moving and breathing on its own, you titter, and you contiplate the meaning of life and how you can get your goals and it makes you request for information all of the stupid things you have done. It make you see another reality of things and suddendly everything that you didn't understand become clear. Basically.
I've never been on it but i've seen friends on it... this is what they did
Constantly shift within head because they said things in their peripherals looked too strange
Crack in attendance jaw
Shake their hands and foot because they felt thmselves become a part of the globe
Have conversations with objects
Hear and see things repeat (i.e: trails and strobe lights)
it is one of the most amazing experiences one can go through. i come up with you are really missing out if you never try it. you halucinate, see colors, things are brighter, have insights, it kinda reverts you to your basic instincts, make you think more like a unrepressed animal, its really good for a person. it last for about 12 hours.
watch the creeps and loathing in las vegas.