Anyway, it's like with bikes,' said the first speaker authoritatively. 'I thought I was going to get this bike with seven gears and one of them razorblade saddles and purple paint and everything, and they gave me this light blue one. With a basket. A girl's bike.' 'Well. You're a girl,' said one of the others. 'That's sexism, that is. Going around giving people girly presents just because they're a girl.
Terry PratchettIt was the heart of any scam or fiddle -- keep the punter uncertain, or, if he is certain, make him certain of the wrong thing.
Terry Pratchett