Like my turista from LA umpteen years ago on the Rogue: "If we stop paddling, will the raft fall off the tracks?" No shit.
Easy to pick on LA folks. Most of 'em think a river was designed by somebody.
Kidding aside, like casper's talkin' about, it's called a-f*#@ing-drenaline.
4 out of 3 people have trouble with fractions.