Please, don't try this at home.
Batmanning is a new Internet fad that may replace planking in the make-your-own trend world. And besides the fact that it seems as if brain cells are dying every day in that world, it seems very dangerous. Dangerous is just not cool.
To Batman, a peron must hang upside down and hold on only by his or her feet from a door, a ledge, anything for that matter.
So much for using you hands to hold onto things.
Take a look at the weird trend below that was reportedly made popular by a group of Purdue University students who call themselves the Batman Boilers. According to them, they have shot the first successful batmanning video i.e. successful both in Batmanning skill and getting it to trend online.
How about Batmanning while playing the Batman theme song?