Launching movable objects from immovable objects?

i was working on a minesweeper sort of game and this would be a great technique. i could also probably be done with other moveable objects too

 

Weapons and power ups would be interesting.

 

hey it doesn't need to be ten seconds! Im not on now, but someone try placing the box not to spawn at start, spawn time 180, and set the runtime minimum to the maximum. Because it's told not to start at the begining of the round, there's a split second where it is not there at the start.