[Quint]

Wow, that's a crappy situation. Hopefully in a casino the dealer would have clarified player B's action before player C acted. As it stands, either player B or C could be angle shooting if they are so inclined. If the consensus was that neither player was trying to angle shoot then I would allow player B's intended declaration (basically, raise to $30) to stand and then allow player C to act (not be bound by his declaration to call what he thought was player B's all in). Player C could then fold, call, or raise. If either player B or C have a history of angle shooting I would be inclined to declare the hand null and void and return all chips in the pot to their pre-hand owners.

Edited to add: Upon further review, declaring the hand null and void would not be fair to player A, who has done nothing wrong in this hand. I now think that if I suspected either player B or C of angle shooting I would declare the action dead after player A's bet (when thigs got ugly) and only allow players B and C to call that bet. I know this wouldn't float in a casino, but this is a friendly home game, right?