One time this situation happened to me and i got all pissed 'cause i'd have to get up to go to the closet but i got up, turned around, and for sure there was a fresh roll of toilet paper on the shelf behind the shitter. Nature works in mysterious ways...
this reminds me of the time I caught my stepbrother out of the bathroom, I bet, in search of toilet paper. I walked out, he walked out, he saw me and then started fleeing, penguin style with his underwear by his ankles, his fat ass jiggling up and down.