FitzTheRuke
Legend
It just depends, and it's largely an on-the-fly judgement call unless it's something important. I don't usually bother looking up the rules during a game, I'm not sure I'd use them anyway. It's easy to break a glass jar, difficult to break an anvil.
Yeah, I don't think they're particularly good or useful rules, but there are rules for it. But it basically boils down to: Give the object an AC, HP, a damage threshold, and reasonable immunities. Let the players go at it.