A passage from the Erowid vaults:
Quote Originally Posted by http://www.erowid.org/experiences/exp.php?ID=9515
I had awoken from the false reality (at least in my mind) and could now see the real world, people entangled in a rollercoaster made of weed!

The plant smell was very strong and two people with suits on were in the middle of this matrix. A man and a woman. The woman who I was sure I recognised had short black hair. She told me to jump onto the weed rollercoaster and M, his sister and O were all encouraging me to. It seemed like it was going to be great so I hopped onto this moving mass. Suddenly I was entangled by the weed and strapped into a seat. All was still as the ground turned black, all except the green stems of grass still poking out of the ground.

Suddenly the ground started to drop away into nothing and continued until the ground beneath me fell away and I fell. It felt as if I was flying downwards on this rollercoaster at an alarming rate, the g's pulling at my face. Then round a corner I went, it felt as if my face were coming off and then one side of my face almost did! I couldn't feel parts of my face and the bits I could feel were physically hurting me! I was stopped and I opened my eyes. I was deep within the weed matrix, still thousands of people around me as I began to this time sink into the ground. It was like a spiral staircase into nothing.

I was completely shitting myself! I thought this was the end of the world, I thought this would never stop and I'd be going round this rollercoaster into oblivion forever.