After coming home from a rave that got shut down early, I walked in to the bathroom, it was kinda dark, just a little nightlight on the other side of the room, and when I looked down in to the toilet I could swear the water was right at the top edge, like ready to overflow. I was standing there thinking, shit I can't pee or flush 'cuz it's going to go all over the place. I was a little desperate so I actually squatted on the floor and tried to touch the surface of the water to make sure. As I reached out my finger, it went back to normal. Ever seen the shirt that says "Sometimes I pee when I laugh / Sometimes I laugh when I pee" Was true that night.
I've found that when I take 3 - very rarely - I see patterns. Like someone mentioned those Samoan tattoos. Exactly. Seen leopard spots on a guy's face. Another time it looked like there was this thin wire mesh, like steel wool but only a thin layer of it, surrounding a guy's head, and I once looked down to pee (why when I have to pee!!!) and could've sworn there were rows and rows of ants walking along the toilet, but I think it was just the pattern thing and in the dark interpretted it as ants. That time I actually stood there and played with the visual by looking away and then back at it and noticed that the pattern followed.
Personally I like it. When it happens it's like I know it's just the trip and I just sit back and enjoy the free show.