Your all-time favorite hallucination?

[Shell B]

I was walking through the woods and there was a clearing ahead that the light was pouring into. The light looked like a solid wall, so I turned around and walked back. Another time, I sat on the edge of a tub and it felt like it was curling down beneath me endlessly. It didn't get lower or anything. The edge just curled under like a cigarette getting rolled up.