Mets’ second baseman Daniel Murphy went as Elvis Andrus for Halloween last night, making a soul-crushing error in the eighth inning that cost his team the game.

Last night in Game 4, the Kansas City Royals did what they do. They took advantage of a gift, and made the Mets pay.

Down a run, with one out and two on, in the eighth, the Royals had a chance, but it was going to have to come off the Mets’ all-world closer Jeurys Familia, who was brought into the game for moments like this. To shut it down.

Familia did what he does. He got the first batter he faced, Eric Hosmer, to ground into a double play. But Daniel Murphy let the ball go under his glove, the Royals tied the game 3-3, and before it was over they piled on two more for good measure.

And as the ball went under Murphy’s glove and the Royals tying run came across the plate. Mets fans got a bitter taste of what it’s like to be a Rangers fan.

It was the Royals seventh come-from-behind win this post-season. That’s what happens when you take advantage of what’s in front of you.

Now Kansas City heads into Game 5 tonight up 3-1, with a chance to pop the cork in New York.