In 1975 he showed up unannounced to Pink Floyd’s studio during the recording of Wish You Were Here at Abbey Road Studios. Nobody recognized him; he was fat and had shaved off all his hair including his eyebrows. He was incoherent and left without saying goodbye. Storm Thorgerson said that two people had broke down and cried when they found out it was him.
That album as well as Dark Side of the Moon, The Wall, and a lot of their other later material was a tribute to his story. Don’t let this happen to you, king!