Apology Card ( poker )

In lowball, the appearance in the current hand of the card that would have made one's hand the previous hand.
For example, a player draws to A-2-3-4 and catches a four. Next hand, he looks at the first card he receives from the dealer.
It's a five, which he turns face up for the whole table to admire (presumably because some of them may never have seen a five before),
while saying, "There it is, the apology card."