CHICAGO (CBS) — Planking or Owling? Forget about it. Now, it’s “Batmanning.” While the planking trend involved taking your picture in various places lying flat, “batmanning” is much more difficult–and possibly more dangerous. It involves hanging upside down, only by your feet. A group of Purdue University freshmen claim to have started the trend late last month. They made a video that shows them hanging from various locations on campus–from parking garages, stadium gates and statues. While it clearly requires much more athleticism than planking, some fear it could lead to serious injury. There were reports of people hurting themselves...