While I'm sure we've all had the experience where a crucial group member went away from their keyboard at a bad time, a whole different type of disastrous AFK was brought up on the WoW forums the other day. An earthquake in the San Francisco area was cause for a lot of sudden AFKs for many posters, including Delthen who started the thread. It seems that many of the posters actually told their group that they were going away from the keyboard. Apparently they failed to read the recent article on the subject by our own Robin Torres.
Nethaera chimed in with her own story of a group member needing to leave the game due to a tornado warning, one which I've seen occur in-game myself. Personally, the worst thing that's suddenly taken my attention from the game is my dog getting sick or maybe a desperate cry for me to kill a spider that's harassing my wife. What's the worst thing that's caused you to go AFK?