Nightwish in horrific banana attack

Well this is my favourite band of the moment, OK perhaps for the last year or so. Symphonic metal group Nightwish or least the lineup before Tarja left. A reasonable quality sound rendition as far as flash video goes (which isn’t saying much). But one question : why is Tarja dressed as a banana?

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For those of a gentler disposition, the same singer performing in opera mode.