NEW YORK (Reuters) – A comedian, a millionaire and an orangutan. It may sound like the beginning of a screwball joke, but Donald Trump isn't laughing. The famously outspoken real estate magnate has sued famously outspoken television host Bill Maher, demanding the $5 million Maher offered to give to charity if Trump could prove his father is not an orangutan. But legal experts say Trump is unlikely to get a dime from Maher, the host of the HBO series Real Time With Bill Maher, because his offer was clearly made in jest. "It's parody," said Bryan Sullivan, a Los Angeles entertainment lawyer. …