First time I took an 8th of mushrooms, 18 years old on a camping trip with two friends. We dosed on a sunny day around noon, and went walking in search of firewood. Ten minutes later I stumbled back to camp and sat heavily down in a chair as the trees began to unfold and reveal increasing layers of complexity. Soon each tree was an individual with a personality. Shortly after that the intensity got to the point where I just gave up and passed out. Woke up and spent the majority of the trip in the tent sort of surfing the waves of the psychedelic onslaught. The trees were pouring down the mountainside in rivers and tributaries, when I would take a piss I'd lose all sense of direction and my body, I had a true, open eyed hallucination of a robot (my only true hallucination ever), saw tons of cliche'd 60's tie dye / rainbow patterns in the sky, tried to drink from a plastic cup, felt like my hand was doing through the membrane into the water, looking at my friend's face, his eyes would repeatedly fly off the side and into the air... I could go on. Never had anything like that since.