I was at a rave on farm property in the middle of nowhere, and a friend told me that I could have some mushrooms if I didn't find a pill. I looked around but no one had anything, so the friend gave me...I don't remember, enough to make me fully trip.
The problem was that I couldn't tell what was normal behavior ("I'm gripping my face with an open palm. This must not be normal...a girl is staring at me") and was doing horrible at acting normal.
I started going "Woo yeah" or just cheering, or whispering things like "that was good" to myself. People kept turning around to look at me strangely, so I fled to my car. The sky was full of stars, so I layed on my back in my car's backseat and swung a glowstick back and forth on its string, over my head. It looked like my car was a contained galaxy, and the glowstick was a deformed planet floating around it.
My friends found me, I assured them I was OK, and they went back in the rave. They told a girl I was friends with, who was one of the promoters, and she came to find me.
She led me on a tour of the farm at night, and it was a wonderful experience...other than the drug dealer who'd been robbed of drugs (and beat up). He was angrily yelling while a group of people stood in a circle around him. Everyone's faces looked grotesque, and I openly stared in disgust while my promoter friend talked to him.
At one point, she told me "There's a hot tub outside next to one of the buildings. Let's sneak up on it and try to catch people having sex." So we crept through the darkness until we got close. We could hear a girl moaning on the other side of the building. My friend thought it was funny; I was grossed out.
There was an awesome goat that acted like a dog.
Tl;dr Friend gave me mushrooms at a rave. I ended up being led around a farm. Saw/heard a couple having sex in a hot tub, a screaming kid with an ugly shifting face, and a goat that acted like a dog.