Magician unfolds the boards to form the box and places a balloon into it.
He pierces it with many solid spikes…  The balloon doesn’t pop, but remains inflated state.
When the last spike is pieced, the balloon ACTUALLY pops with the sound… 
It seems the magic is going wrong….   All spikes are removed and checked inside the box…. 
WOW!!  The balloon that should have been popped comes out in an inflated state….
  -The balloon can be handed out to spectator as a gift
 -Easy to perform. 
 -The box can be folded to be flat, so you can carry easily. 

Please provide your own balloons. The balloon using for this magic is  ordinary & regular one. You can get from your local stores.