I read something on jackin world about how someone got injured trying it

my friend can supposedly do it

he can get his chin down below his crotch...he's flexible i guesss blah
oh shit, once he did show this girl i know. He basically had his clothing on at schoolo and stuff, and we were sitting down in class, and he says "look at this dude" and basically he just got his head past his crotch while sitting down.

That's pretty sick :-x