Yeah, we also had "sorry guys, gotta go - sister's giving birth".

Heh... I actually did this. My wife started labor for our third child while the raid and I were working on H-LK last October. I just said on vent, "gotta run, folks -- baby is coming" and hearthed.

I think the best we had was back during bear runs in ZA one of our pally tanks had informed us some bad weather was coming through his area. I don't remember where we were in the instance, but he just said over vent, "tornado is here... gotta move". He picked up his laptop and played from his basement/shelter area while a tornado blew through his town.

I have also had this happen, except the woman was our raid leader and she went into labor during a run through Karazan. I will never forget the day I had to help my GM count through her labor breaths as her husband called an ambulance.

I had a similar one in a Botanica run back in Burning Crusade:

"brb, cat giving birth"

Explained shortly afterward that her cat was in a box next to her desk, taking a rather long time to do nature wonderful, messy miracle.