Jet skis look like a horse running and defecating at the same time on the water. Today on The Gist, Kurt Braunohler battles Asian carp and electrified waters for his new Comedy Central Web series Roustabout. For the Spiel, we explain a ubiquitous preamble, “the idea that somehow.” Today’s sponsor: The Jinx: The Life and Deaths of Robert Durst, the new documentary series from HBO. It airs Sundays at 8 p.m. only on HBO.