I sent him this photo from my work trip (yes, our vacation is over). Then he was visiting some friends and noticed their toilet paper was not right, according to the Toilet Paper Hanging Doctrine of Primo.
He asked on facebook if he should correct the problem or leave it alone.
I was shocked at how many people - friends of his - thought it was perfectly OK to change the toilet paper in someone else's house.
It's not your house, people! You don't get to make the rules.