LSD didn't used to be a street drug, originally it was considered a wonder drug, part of the post-war belief in "better living through chemistry." That's when Hollywood mega-star Cary Grant was a big advocate for the potential of acid. But that all changed in the '60s. This week, we take a groovy psychedelic trip with Carrie Fisher, Marc Maron, and the Grateful Dead to find out how LSD became illegal. Also John Lennon and Keith Richards enjoy an LSD-fueled magical mystery tour through England on their own acid road trip.