Of course, 2001 was just one of a long lineage in psychedelic films that intentionally or unintentionally were a joy to watch under the influence of hallucinogenic drugs. The genre also includes ...

Whoa, look at those penguins! CNN? Sure, why not? But the greatest trippy movies make you feel stoned even when you're not stoned and make you think about life even when your brain is turned off.