This is done whith weeble mod:
Hold all
Contract knees
Space x 6
Extend knees
For some reason your legs blow up in pieces :P

Here's how to use that leg blow up for a little bit of points for yourself xD

Press C
Contract Knees
Space Times 2
Extend Knees

Now thelegs disapear:
hold all
Contract knees
space x 6
extend knees
space x 1
contract knees
space x 1
extend knees
Now thats some crazyness!
Oh finded more strange stuff
Do NOT hold all
ca\ontract knees
Space x 2
Extend knees