By the way, what would the ruling be on this? (I'm not sure if this is exactly how it went, but it was something like this)
Player Araises tobets 30
Player B throws 80 in the pot, as he announces 50.
Player C correctly points out that:
1) the verbal action is binding and
2) the amount announced does not constitute a legal re-raise.
He thinks it should be ruled a call. I wonder if announcing an amount more than the call constitutes a binding raise, and thus it should be ruled a min raise to 60?
If the 80 in chips were 'wagered' (however that is defined in your game), then the verbal declaration afterwards is irrelevant. You state he 'throws 80 in the pot', which to me, means they were already wagered when he made his announcement.
In most cases, if the chip(s) hit the felt prior to any verbalization, the physical action stands. For example, you can't toss in two $100 chips and then say $150. Once the chips hit the felt, it's a $200 bet. Same as tossing in a $100 chip, then saying "sixty". It's a hundred dollar bet, unless verbally stated otherwise first (similar to the single-oversize-chip=call).
In some games, crossing the betting line is sufficient. In others, the chips must be physically released.
In the above case, if the verbal action was made prior to the physical action, then a min-raise of $60 is the correct ruling.