Olaf the Stout
Legend
It's happened in our 3.5E game a couple of times. On one occasion I think the Rogue may have even encouraged it. He was confident that his high Reflex save would keep him safe (and it did on that occasion). His HP's are low enough that it is asking for trouble though.
On another occasion I think the party fighter may have been hit by an AOE, but wasn't particularly fussed as he had more than enough HP's for it to be a worry.
In general I wouldn't encourage it unless the players were ok with it. That's up for the players involved to sort out though. If a player wants to do it, I don't think the DM should stop him. Do it enough and it may result in an alignment change though.
Olaf the Stout
On another occasion I think the party fighter may have been hit by an AOE, but wasn't particularly fussed as he had more than enough HP's for it to be a worry.
In general I wouldn't encourage it unless the players were ok with it. That's up for the players involved to sort out though. If a player wants to do it, I don't think the DM should stop him. Do it enough and it may result in an alignment change though.
Olaf the Stout