Cause you never know when you'll need to crawl under one.
Scene: Tuesday evening, crowded college classroom - 40+ students waiting for my information session to start. Across the room I notice a girl I went to high school with who is visably pregnant and wearing a maternity shirt.
Dumb ass: Well aren't you adorable! How are you feeling? (points to belly)
Innocent little lamb: Great, thanks for asking.
Dumb ass: When are you due?
Innocent little lamb: Um, I had him last Friday
Dumb ass: Well, uh, you look great. Gotta go, I need to start the presentation!
Insert foot in mouth.