Ok, so I had this conversation with a friend of mine who is a vegetarian.
Seems I decided to try and convince her that eating plants was causing murder on a global scale.
You see, plants create oxygen, and we need that to breathe. Cows consume oxygen. We need to eat the cows so that we survive.
By eating the plants, they are taking away oxygen and killing both the cows they want to save and humanity.
That didn't quite go over as well as I expected. I got one of these
looks for a few minutes, then it was a hesitant trip to the salad bar. I dunno, I think I'm on to something