I was with KathyWdrf at the CNN Center in Atlanta just last week when we spotted a door with the following sign:

THIS DOOR MAY OPEN

She took a picture of it with her camera.

The door was already closed. What else is it supposed to do?

By the way, I witnessed the door being opened while waiting for her...
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Not related to the above, here is a sign found on Interstate 70 in Colorado heading east towards Denver from the Rocky Mountains, alerting truckers not to be fooled.

I laughed when I first saw this sign, found on either side of the eastbound traffic lanes of Interstate 70. It is one of the few highway signs that contains more than one complete sentence.