It was August 28th, 1964 and Dylan had stopped by to meet the Fab Four at their Manhattan hotel room. As the story goes, Dylan immediately pulled out a joint and starting puffing.
The Beatles - who had barely tried pot up to that point - joined in and got "ridiculously high" ahead of their concert that night.
Years later, Ringo Starr recounted the story onConan, saying they "laughed their asses off".