Asked a woman when she was due, and she completely lost it and dropped a string of profanity cussing me out - turns out she had just had her baby less than a week before. Heck, I even knew she had been pregnant, but missed the memo that she had already had her baby. Turns out I was the 3rd or 4th person that had asked her that question that same day.

Ive decided it best to never ask the question, no exceptions.