Armature go limp like noodle, how? I want to have a character lift some really heavy weights then his strenght goes out and he collapses like a house of cards. 

I know how to make the weights fall down in a collision, but how do I make the armature / object suddenly fall down like its made out of noodles? Is there a modifier or state for that so I don't have to animate the complex chaos of a limp fall?
You can turn the skin into a softbody and make a new armature made out of mesh bones and apply rigid body constraints/joints .

But physics simulations cant effect regular armature bones.

But I think its a good idea, you should pitch that idea on rightclickselect