As soon as the outer protective edges came off, they were ready to build teepees and use them as limbo poles. Of course, with 3 boys the very first thing they wanted to do was turn them into swords, but with the rule of "no weapons" they had to find other uses for their new toys.
It just goes to show what moms have known for generations. It doesn't matter how much you spend on a toy, the kids are going to have more fun playing with the box!
What's the most interesting thing your kids have ever done with a box?