To keep with the recent theme of bathrooms (it's not that I am fixated on them, they are just easy targets that everyone must visit sooner or later), let me present you a sign I saw on a door to the men's room at a client site.
I read this and instantly had to ask myself, "If it's automatic why do I have to press the button?" That seems fairly straight forward don't you think?
Another note on this sign. I was working onsite with another member of the team and after I took the picture and returned to the cubical he looked at me with a smirk on his face and said "You just took a picture of the sign on the bathroom door didn't you? I saw that earlier and thought to myself that if he sees this it will be going on his blog. Am I right?"
I quickly reminded him that nobody likes a wiseguy except the wiseguy.
And then I proved him right. :D