So you've just built that new roller coaster.   It looks good on paper, and in theory.  Engineers have put it through stress tests, weight tests, safety checks...and you've done hours of dry runs.  Now it's time to try it out with real people on board.Do you recruit amusement park workers?  Family members?  Or do you bring in as many hot babes in lingerie as possible?  Don't bother answering, just watch the video.