On Piper At The Gates of Dawn, on the song Flaming...At the end verse, you hear Roger behind Syd's singing, saying: "Yippie! You can't HEAR me but I can you"...its kinda creepy...I wonder if that's a hidden message too?

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"Are there any paranoids in the audience tonight? Anybody that worries about things? Pathetic! This one's for you, its called Run Like Hell"
(Roger Waters, The Wall Live 1980)