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Just a quick memory flash. Wallis was, I believe, a physics teacher. Another gnome, about 5'0" of pure spite. He dressed, or tried to dress more accurately, like a hippy. Don't think he was around too long.
I do recall an incident where we connected quite a few Bunsen burners up to the water taps and showered the entire class. He went apeshit and ran off down the corridor screaming for Monty. Needless to say another mass caning ensued.