In baseball, a hanging curve is generally thought to be a very hittable pitch, usually implying the ease in which a player can hit a home run. A hanging curve is an easy task in which the chances of success are high.
"All you have to do is show up, shake a few hands, and we'll pay you $1000."
"Sounds like a hanging curve ball!"
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.