Last time I remember it was 2009. Ron Wilson (coaching the Leafs) called for one against Spezza. He took a lot of heat for it in the media because it was essentially a meaningless game.
I imagine the reason more coaches don't do it is because most of their players are running around with illegal curves too. So it's kind of an unwritten rule where you don't call the other coach's guys out for it and he doesn't call yours out for it.