Let me drop some things I remember here, for that I really like Pink Floyd, Syd and David Gilmour:

At an early gig, Syd wanted everybody in the club high, literally, so when everybody was in, they burned some 100 grams of dope or weed into the ventilation-system before the gig. It wasnt like expected, but after all, WTF. :D

After Crazy Diamond was recorded, Syd appeared to the studio, he was without hair and in terrible condition so the other members of the band wouldnt even recognize him at first, when he listened to the intro, just said: "boring" and left the studio. Imagine!

Imo he was a talented musician but at some point, drugs waste a mind and he never came back from his trips.

It's time to listen Interstellar Overdrive full volume. :)