For those of us who don't fancy the psychological side-effects of cannabis, but want to see what all the fuss is about, I've devised the following pseudo-stonedness induction technique (PSIT):
Step one: Make sure it's dark and you're in a dark room - switch off the light if necessary
Step two: Load up the Let It Be... Naked version of Across the Universe into iTunes
Step three: Set the Visualizer to full-screen mode, press play and turn it on
Step four: Stare at the screen
Works best when suffering from sleep-deprivation.