well, this reminds me of my theory of fart ambiguity.
the theory states that for there to be any real chance of ambiguity about the source of the fart there have to be more than 2 people present.
Hey! no need to limit this to actual people yeah? I have 2 dogs and a cat....so hence my "girls dont fart" theory holds out most extremely well with such an abundance of blame-takers.