Yah i've had so called "acid" before. They were selling it at school. I took one hit for 5$ and i didn't notice much. This was like 2-3 years ago and i just remember staring at my friends roof and just feeling mellow. But it could have been a placebo effect. I noticed something though. I can't explain what but it was just a weird peaceful, relaxed feeling. And i kept staring at the roof and the little stucco bumps on it. It probably was just paper with a printed blotter pattern or something or it had a tiny amount of acid in it. Either one.