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We've strayed into a zone with a high magical index,' he said. 'Don't ask me how. Once upon a time a really powerful magic field must have been generated here, and we're feeling the after-effects.' Precisely,' said a passing bush.

Terry Pratchett (2012). “The Wit and Wisdom of Discworld”, p.5, Harper Collins
We've strayed into a zone with a high magical index,' he said. 'Don't ask me how. Once upon a time a really powerful magic field must have been generated here, and we're feeling the after-effects.' Precisely,' said a