Ya can'ta change the laws of physics

I was in my bathroom about to do what you sometimes have to do in the bathroom (not number one, but the other one). I happen to catch the bathroom scale from the corner of my eye. I decided I would perform a little experiment to see how much weight I could lose in a session. I stepped on the scale, and it showed 16x.2 (the x is to protect the innocent and my actual weight). After stepping off the scale, I performed the bathroom function, and I stepped back on the scale. To my horror, the scale now read 16x.4! I had somehow managed to take a -.2 poop. Scientifically, this shouldn't be possible. If a hole has been ripped in space time, you can blame it on me.