Is my hand dead?

[sfer]

Live 15/30 at the Wynn a couple of weeks ago. HU on the river, the board is 33Qxx. I have KK. A player, very tired, possibly slightly drunk, bets, I call. He calls out "Q3" and I muck my hand. My cards slide across the automatic shuffler but do not hit the muck. He says, "Wait, I have Q4," and I grab my cards and turn them face-up. Lots of friendly banter at the table so I highly doubt that this was deliberate. Who gets the pot?