I was in a consulting gig about 9 years ago and had recently joined a project team that had been client side for awhile. My role was supporting the senior partners on the project and at the time was still fairly junior. I had worked for one partner (A) prior but the other partner (B) I had no prior experience.
It is my first week, and everyone is chatting about summer plans, etc. Partner B is going on and on about his summer plans to go to Hawaii and hadn't mentioned significant other, wife, or kids, etc. I am wanting to build rapport with Partner B given no prior relationship so I ask about his plans while on vacation, and we go back and forth for 5 to 10 minutes so I think the conversation is going great. But still no indication who he is going on vacation even though I tried multiple times to allude but not directly ask.
Finally, I end the conversation not thinking but state that his wife must be excited. The whole rooms falls silent. Partner B sharply tells me that he is gay, and he will be going with his boyfriend. I sheepishly apologize and go back to work while the room stays silent.
I only later found out that week that Partner B recently left his wife of 10+ years and started dating men and that it was a huge scandal in the local office.