Lately its people who don't listen - and working in IT (well, probably any profession really) it is one of the most frustrating things in the world. So you try and explain something "Okay on your right hand side there is a large blue button" "Well I'm looking on the left and I don't see any buttons" *face palm* I had to attempt to describe to someone yesterday how to click and drag something and they just couldn't get it, if I could have smacked them one I would have!
Lol and yes, I'm in on the toilet roll thing too - they must be "over" not "under". I will actually take them out and turn them around if someone's put it on wrong (except at work where the toilet roll holder is an absolute b!tch)