We need one.

The 16D Rapid-fire Nail Gun by De Walt.
It can drive a 16D nail through a 2 X 4 at 200 yards.
This makes construction a breeze, you can sit in your lawn chair and build a fence.
Just get the wife and kids to hold the fence boards in place while you sit back, relax with a cold drink, when they have the board in the right place just fire away.
With the hundred round magazine, you can build the fence with a minimum of reloading.
Thanks to my mate Marc. (I imagine he'll be going on a fence-building spree in Townsville any day now)