“When I was a kid, I used to break into houses … This is ‘The Thief,’” says Future Islands’ sweat-soaked, undisputed spark plug of a vocalist Samuel T. Herring. That gets a couple laughs before he builds up to the track’s chorus. All night, without taking so much as a quick break, his body has gyrated, leapt, danced, and lunged like a human amusement park ride for the band’s throngs of fans, who have waited 10 years for this moment.