If I play Dave, will you help me to follow the State money trail?
It was Dave’s misfortune that the president needed a double. And then, through the sort of twist of fate that can only happen in the movies, the real president has a massive stroke, his henchmen decide that it’s in the national interest that no-one should find out, and Dave suddenly finds himself having to act as president of his country.
Dave was a movie, of course. The actor Kevin Kline played both the ordinary citizen, thrust into hugely onerous responsibility, and the president, and played both parts brilliantly.