Slingshot

Technology certainly has changed since I was a kid.  I can understand the sight and the grip and the wrist brace at the back - not sure about the doodads that flare out to the sides in the front.  More pix here.

Those who are interested in this subject matter would probably enjoy viewing the video of Rufus Hussey, the "beanshooter man."

Addendum:  Melissa reports that the flaring components are stabilizers, similar to those incorporated into competitive archery equipment, as described at this link.