Why do all automatic doors say "Caution Automatic Doors" on them? Because if they're automatic they'll be out of your way when you get there and there is nothing to be cautious about.
Someone brought the fact up that maybe it's because they sometimes don't open automatically.
But if that were the case, and you weren't paying attention enough to notice that the doors didn't open in front of you, then the sign is going to do you no good.
Layout is cool. I'd better add this to my Favorites!