Acid Substitute

PZ Myers has found a non-chemical inducer of a bad acid trip:

My cortical neurons were arcing and snapping and dying with agonized wails from the first page; it’s like the dark book of the mad Arab Abdul Alhazred to rational people, where words writhe in insane alien geometries and infiltrate the mind of the reader, leading to madness and death and worse-than-death.

Caveat Lector!