I've DMed for at least three years or so, but I came across something during a session the other day that was totally new. Two of the PCs were fighting--certainly not anything new--and I wasn't too worried because usually they exchange a few blows for some subdual damage and call it good. But, for some reason, this last time it turned into a "real" fight... Once one player finally stopped, the other decided that he was so upset he should kill himself (I really can't figure out what inspired that line of thought ... the player has issues, anyway).
So I had to figure out how to handle what happens when a PC attempts to attack themselves. I decided that, if they're really serious about it, they can treat themselves as helpless and get an automatic critical. Of course, he was a rogue, so that includes sneak attack damage. Luckily, the party cleric blew her only cure crit and stopped him from dying.
Has anyone else had to deal with something like a suicidal PC? How do you (or would you) handle it?