OK, one of my pet peeves is seeing an empty roll of toilet paper in the holder.
I work in an office building with several women and I come across this more times than I'd like. Really ladies, what is so hard about replacing a roll of toilet paper? There's toilet paper stacked right there on the shelf, even!! What's more irritating is seeing both holders empty. Seriously? Not one of the ladies who used the stall could change it? I really doubt we're taking away the cleaning lady's job by showing consideration for the next user . . .