[johndallman]

I don't deliberately hide my rolls, but since we usually play with people spread around the room, the dice are a bit small and far away to be read. This does allow me to call for witnesses to especially dramatic criticals and fumbles.

I once delegated dice rolling to a disruptive player in a convention game as a psychological tactic. Her character had been trying to solve all issues with violence, in a low-level D&D horror scenario that really wasn't about that. They eventually arrived at a large, slightly fortified and crumbling manor house, and the character immediately went mad on the bell-pull, swinging from it, trying to pull it off the house, smashing at the door …

"A large stone drops off the battlements on you. 2d10 damage, you roll it." I turned away to talk to the other players. The delinquent player got the idea, that I really didn't care if she got her character killed, if she was going to behave like that, and calmed down immediately.