OK, so my pet peeve is people who don't replace the toilet paper roll.
I mean really guests, You are doing nothing but sitting there! You've already gone to the trouble of getting a new roll from under the sink, why not replace it?
Or so I thought.
Twice this week, i've encountered a more insidious behaviour - guests who grab a new roll, but don't draw down the original toilet paper. Now I'm stuck with some toilet paper still on the roll and a partially used roll. Grrrr......
It is so devious. In their mind, there is no responsibility to replace the roll, because they did not use up the last roll. Reminds me of the college roommate who alway left one last swig of milk in the fridge...
Guests - you have to love them