Obviously, if one is capable of building the world's largest slingshot, one should do so without delay. If the question is "When is an appropriate time to build a giant slingshot?", the answer is always "Yes." Therefore the dudes at the app development firm Dude Perfect did so, using a tree as the handle. Watch a video of its construction and operation at the link.
Video Link -via Geekologie | Company Website (warning: auto-sound)
Gatling Gun Slingshot