“Suppose… you watched an iceberg drift through the chilly waters, and you got to know its cargo of happy polar bears and seals as they looked forward to a brave new life in the other hemisphere where they say the ice floes are lined with crunchy penguins, and then wham – tragedy loomed in the shape of ten thousand tons of unaccountably floating iron and an exciting soundtrack…”

– Terry Pratchett, Thief of Time