In his 1999 ‘Comedy Central Presents’ special, Mitch Hedberg delivered a now-iconic joke about acid. By treating psychedelics with his trademark casual surrealism, he helped normalize a topic that was still culturally radioactive. Also featured on his 1999 album ‘Strategic Grill Locations,’ the joke marks a subtle cultural shift. By the late ’90s, the psychedelic underground was still climbing out from decades of stigma, and humor became one of the first pressure valves. Without advocating or mo