Yea, you would for example have to have alcohol generated in your stomach after sucking in urine from the toilet, combine it with ingredients in your liver, and have it come out of your mouth into countless bottles that are sent to grocery stores, where people walk backwards to pick up money and leave items, from where the bottles are sent back to factory and separated into basic ingredients that are then returned back to the nature.

Ultimately we all implode into a singularity (unity?) where see more time and space are zero. I actually like the concept of total reversal much more than Woody's simplistic take on it, if we are to get down to business and start reversing things around.