JACKSON, N.J. (AP) — The Joker is no joke. A New Jersey theme park on Thursday previewed its latest roller coaster that gives riders a feeling of weightlessness. Coaster enthusiasts and season pass holders were the first at Six Flags Great Adventure in Jackson to board The Joker, which is named for the DC Comics character. The free-fly coaster features head-over-heel flips, drops and a 120-foot lift outside the confines of a traditional track. The roller coaster opens to the public on Saturday.