YTF made this thread. Well done sir. I wish you dealt every table I played

Yes, I would like to agree. Great job explaining the concept from YTF.

This is simple by asking yourself a few questions:

1.) Am I the dealer?
2.) Do I have a hand?
3.) Do I have chips in the pot?
4.) Is the dealer Obviously Misreading a hand?

If the answer to these questions is no, then STFU.

5.) Has the first riff of the cards been made?

If the answer to this question is yes, then STFU.

(Sorry for sounding harsh, but players who get involved in hands they are not in are So Annoying. You are not the dealer. You have Nothing to do with this hand. You do not gain or lose chips regardless of the outcome. There is not an Obvious Misread of a tabled hand. The next hand starts as soon as there's any part of a shuffle, so it's too late to change anything except a Major error.)

Verbal concession followed by 'pushing the cards to the muck' effectively kills the hand and concedes the pot. The Only way this action can be changed is when the tabled hand has Obviously been misread by the player, and even then it's at the discretion of the house as to whether to declare the hand as live and award the pot to the player who conceded it or not.

See Above.

Cliffs: If you table a hand and declare someone else wins your hand is live and cards speak. If table your hand, push your hand into (or even in the direction of) the muck, your hand is dead and the house would have to overrule your action and declare it as live to award you the pot.

Again, sorry for sounding harsh to the OP, but, really, let the dealer run the game and stay out of hands you're not involved in. The game will be more fun for everyone...

First of all, misreads don't have to be "obvious"; a hand either wins or loses.
Second, verbal concessions at showdown really are meaningless; what matters is what you do with your hand.
Third, let's distinguish between tabled (which means properly exposed faceup) and untabled hands. If you do push your hand forward facedown without tabling it, and it winds up in the muck, somewhere during that process (depending on house rules, which really vary a lot on this), it will be considered dead and have no further claim to the pot. (Usually this point is the cards touching or entering the muck, but can be different, e.g., losing control of them to dealer, or crossing betline , etc., depending on local rule.).
However, in most rooms, even if you've verbally conceded ("You win"), and even if you've pushed your untabled cards forward facedown, they are still live (and speak), if you can grab them back and expose them ("Oh, wait, I have a flush") before they're reached whatever point kills them. And they still speak regardless of how anyone's previously read them (or of any prior verbal concession).
But once you table your hand (faceup), regardless of what you say or how (or if) you read it, and regardless of whether you or the dealer then muck it, it's NOT dead, and cards are supposed to speak. Of course, as you say, this may require a floor decision, especially if the cards have been put into the muck, but generally, once a hand is tabled, it's still live, at least until the next hand starts, and floors will usually rule this way.
Finally, cards do speak, but only if someone reads them ( ) and it's the ethical obligatiion of every player at the table to try to correct errors in awarding the pot.

For someone not in the hand to get involved in the hand, there should be a misread that's obvious. (Obviously it would be obvious to the person reading the hand and noticing the error.)

Really a non-point. I just answered the questions and made a distinction.

Then would this be covered in RRoP?

Sorry, but AFAIK everywhere I've played if a player mucks his hand, regardless of whether the hand has been properly tabled or not, the hand is dead. If the dealer does it after it's been tabled, it's a different story.

Obviously there's some room for interpretation, but where I've played and dealt if a player mucks his own hand, it's dead, because he neglected his responsibility to hold onto his cards until a winner was declared.

In the OPs situation, by pushing the cards to the muck rather than holding his hand until the dealer declared a winner, the player killed his own hand.

Don't be sorry, but this isn't the case most places I've played. Once a hand has been tabled, even if player pushes it forward facedown, if hand is not yet unidentifiable in the muck, cards can be retrieved ("Wait!"), and are live; even if hand has found its way into the muck, and even if pot has been pushed, floor will generally base decision on dealer's and players' memories of the tabled hand.
If hand was never tabled, and if player can grab it back and table it before it passes whatever point kills it, it's still live; but if it passes that point, it's dead.
Of course, all of this is only at showdown; facing a bet, any clear verbal concession or almost any forward motion of cards facedown should be an irrevocable fold.

Yeah, it's interesting how the rules/interpretations change from house-to-house...

In games I've been in with experienced players it's not uncommon to have a river bet, a call, the bettor say 'you win' or 'good call' table or show a bluff, muck and not ever see a card from the winning hand.

I actually don't think there was even a dealer error in the situation the OP outlined in this thread since the player killed his own hand rather than holding onto it until the dealer declared a winner... IMO once the player who tabled his hand neglected his responsibility to hold onto it by pushing it into the muck there was only one live hand at the table, which was the hand with the 8 in it, whether all the cards from the hand with the 8 were shown or not. If the player who mucked wanted his 'cards to speak' he shouldn't have released and killed his hand.

a portion of a hand was shown that could beat the entire other hand of the opponent and the opponent accepted that and mucked his hand. the action is accepted and the hand is over. if you wanted to be a busy body the only time to do it was before the winning hand was dead, doing it minutes after the fact is mind blowingly out of line