A New Jersey mom is creating an innovative present for her son and his unit. What's inside the box? Silly string:

American troops use the stuff to detect trip wires around bombs, as Marcelle Shriver learned from her son, a soldier in Iraq.

Before entering a building, troops squirt the plastic goo, which can shoot strands about 10 to 12 feet, across the room. If it falls to the ground, no trip wires. If it hangs in the air, they know they have a problem. The wires are otherwise nearly invisible.

Whodathunkit?