The nuns used to carry long wooden pointers with rubber tips, and not just for pointing at the blackboard. When one of them said that God can do anything, I raised my hand and asked if God could sin. (After all, that's what we being taught - a hierarchy of severity of sins that could get you damned to hell or lock you up in purgatory for a long time.) That nun was old and rotund, but she was lightning fast with that pointer. My poor knuckles.