From the show Avatar: The Last Airbender
A variation of waterbending in which a master waterbender utilizes the power of the full moon to control the water in the blood of all living things. Hama, a survivor of the Fire Nation raids on the Southern Water Tribe, developed the technique while being held prisoner in a Fire Nation cell. The prisoners were given no water, so Hama had to improvise. She spent years developing the technique and practiced on the rats that scurried across her cage. Finally, she used her new skill to break out, controlling the guard to use his key to open her cage.
Hama invented Bloodbending and taught it to Katara. Hopefully, Katara will utilize that power in the 3rd Season
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"