#482. When designing a setting for a public restroom, never put the doors for both the Women's Room and the Men's Room in adjacent corners right next to each other. (They actually did this at my place of employment.)
#637. Ladies, when a man holds a door open for you, make sure you know where that door leads--it might cause you to walk into a place you;d never want to go, and cause you to see things you'd definitely never want to see.
I can't tell you how many times at work that a polite, well-meaning gentleman has noticed a woman walking behind him, and then graciously tries to hold the door open for her... Except that it's the door to the MEN'S bathroom, and not the Women's.