If you are even vaguely familiar with Heavy Metal (the movie, or the publication, or with questionable late 70's early 80's pulp sci fi in general), then you will most likely get some serious lawls from
this South Park clip.
It's kind of a long story... The kids have discovered that you can get high from sniffing cat pee (okay, short story) but the resulting hallucination sequence is pretty goddamned classic regardless.