Incredibly bizarre player behavior, then wishy-washy floor decision

[private joker]

Commerce 20/40. I'm not in the hand (anymore).

Three players at the river. The button has been the aggressor. The dealer burns and turns the river, and the button leans his chair back on its back legs. The first guy to act (EP) checks. The second guy to act (MP) checks. The button then notices the action is on him and slowly leans his chair forward on all fours and hunches over the table, muttering, "let's see here" and takes the chip off his cards so he can look at them, still covering them with his hand.

EP then mucks, MP turns his cards face up and asks button, "Show! show!" And button thinks for at least 5 more seconds, then puts 8 yellow chips on the line.

EP and MP furiously protest that he checked and can't bet now that MP's cards have been shown. Button protests that he never checked. The dealer is stymied and says nothing, so button calls the floor over.

MP and button are arguing loudly about it, with button absolutely shrieking that he should be able to bet at this pot. The floor calms everyone down just long enough to find out what happened. He eventually says there was too much action before button bet, meaning the EP's muck and MP's showdown, so the bet will not stand and button needs to just show his cards.

Button gets really angry and this and says he won't accept it. He wants to see a supervisor and wants to see the videotape. Then he proposes to MP that they both chop the pot instead of showing down. MP doesn't like this idea, and says "If you bet, I'm gonna call you." So the floorman listens to this new deal, and says, "OK, if you wanna bet, go ahead. I will let him call you, and then we'll show cards."

Button hates this plan even more. He protests one more time, and the floorman tells him he can't have it both ways. He now simply demands that button show his cards. Finally button stands up out of his chair and fires his cards face down into the muck.

Now MP starts yelling that he wants $40 from button, but the floorman laughs it off and leaves. MP rakes the pot. Button tilts off the rest of his chips in 20 minutes.