ummm...yeah, if you are huge roger fans, like me, its obvious that its roger as the teacher on "the happiest days of our lives", and he also does the "if you doon't eat your meat...etc", he is also shouting to the baby before "Nobody Home" where he says: "Oi! I've got a little black book with me poems in"... and there are more, I'm sure...he also says "Isn't this where...we came in?"

So, yes, listen long, listen hard everyone...ITS DEFINATEly ROGER WATERS!

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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)