Just a thought: How would I turn a stickman to a ragdoll?

In game I mean.

Basically, when the stickman reaches a certain event in the game (like getting hit by a car), how would I 'switch' the stickman sprite into a ragdoll sprite?

Well, you could try, and I again TRY. To create the body and limbs of the stick figure as separated objects and try to make them work together... although I still don't think this would work properly.

You can however make ragdoll animations, and change the object physics every time it gets hit.

But I think for this kind of effect you should try using Adobe Flash or something o-o