Basic Physics

Hey guys.
First off I would like to say I am new to using/rendering physic simulations in blender. I have some experience in the BGE, so i know my way around blender.
I have seen tutorials explaining how to make a cube shatter (such as this one http://www.youtube.com/watch?v=LqWWwcdFed8 )

But how do I make that happen when its standing still? For example, I hope to do some tests with it and track it into real footage. So it would look like a building is toppling down.
So I don’t need it to explode, rather, for it to collapse on itself.
Or even to do something like this http://www.youtube.com/watch?v=ZthCiJLecfo&feature=related

Thanks for the help, and I’m sorry if this question is asked alot.
Thanks for your patience,
~Coonerboy

if you read the “fracture addon” postings here (and shure on its web-site)
he uses a logic-brick setup to disable dynamics and at collision the dynamics are enabled.
If i understand this in the right sense, this freezes the rigid-body object.
There is a sample blend-file at his site for blender-2.57 with this setup
in the game-logic-bricks. (and he has some routines to setup these things for a whole bunch of objects, so once has not to set these for every object by hand)