I've never actually tried concocting recreational hallucinogens (those long DIY articles in Flipside involving morning glory seeds, acetone, and cold medicines always sounded to me like a surefire route to brain damage and/or third-degree burns) but I happened upon an effective recipe last Wednesday night.
1. Come home unexpectedly tired after having downed a couple pints at a book launch.
2. Lie on couch, close eyes, and drift in and out of consciousness while this album is playing: