There’s never been a moment quite like this on “American Idol,” the U.S. version of the British TV show “Britain’s Got Talent.” It’s an unassuming cellular phone salesman who professes to want to sing opera. Simon Cowell looks like he’s thinking, “Yeah, sure, mate.” But watch. See the crowd’s reaction, and see the Brit version of Paula Abdul brought to tears. By the way, he won the whole thing.