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Don't they do it because it's easier than booing?
Or maybe 'boo' has too many syllables for them!
C'mon the
My understanding is that he is just a local that took to doing it purely for the noise (I suspect probably at the NPC games) and became a tradition. I heard that he was in fact a tree surgeon, so I guess it is possible it was more coincidental than that - trimming the trees in the park from his cherrypicker, game was on...