It took this venerated amusement park years to get its Flying Turns ride working. It is a kind of bobsled roller coaster. There is a legend (unverified and reputed by the park, apparently) that a crash test dummy was decapitated during testing. See, for ex., http://sfneonline.org/forums/index.php?threads/knoebels-discussion-thread.1137/page-2 - and - https://www.facebook.com/permalink.php?story_fbid=604436616291207&id=185676181500588 - and - http://www.townandcountrygazette.com/2014/06/26/exclusive-top-ten-thrill-rides/.