Book excerpt: Britain's very-own embarrassing (royal) granddad turned 90 this year and this shamefully funny and occasionally on-point collection of the Duke's greatest gaffes celebrates the best from a lifetime of quotes that made the nation groan with embarrassment. With illustrations throughout, this is a laugh-out-loud funny tribute to the master of mis-speaking: When accepting a figurine from a woman during a visit to Kenya he said: 'You are a woman aren't you?' He asked a Scottish driving instructor how he 'kept the natives off the booze' long enough to get a licence. In Cardiff he told children from the British Deaf Association, who were stood by a Caribbean steel band: 'If you're near that music it's no wonder you're deaf'. 'Still throwing spears?' - a question to an Aborigine during a visit to Australia.