polymath
Bluelight Crew
No one in this thread has mentioned volatile anesthetics like ether and isoflurane, which cause a delirious state when taken in sub-anesthetic doses. Their exact mechanism of action is unknown, but there is evidence of activation of GABA receptors and blockage of NMDA receptors. I've tried chloroform once and I'd definitely call it a deliriant, but I wouldn't do that again(just to save brain cells).