The "overshare" is something most of us are guilty of at one time or another. Sometimes you misread the room at a dinner party, or forget that your work office is not your therapist's office (even if they have a similar asthetic). And while sharing too much information is not a crime, it can definitely cross boundaries and leave people around you uncomfortably squirming in their seats. There are certain stories and tidbits of information that are best kept to onesself (feel free to forward this to your co-worker Kathy who is always talking about her sex life at lunch).
1.) From mblessedRadiant:
A (strange) coworker, whom I wasn't ever close with, decided to tell me at work - across the entire office - that she and her husband were having marital problems due to lack of sex. He wanted more sex. But since she wasn't trying to get pregnant, she didn't see the point and said he needed to get over it.
This happened loudly, out of nowhere and with no prompting. What made it more uncomfortable was that she was our HR person.